sequester
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C1 verb sɪˈkwɛstər

sequester

Meaning
To isolate or hide away.
Example
The carbon captured by trees can be sequestered for years.
C2 adjective /ˈstraɪ.eɪ.tɪd/

striated

Meaning
marked with thin lines, grooves, or stripes
Example
The muscle fibers appeared striated under the microscope.
C1 adjective /ˈsʌltri/

sultry

Meaning
Uncomfortably hot and humid; also describes someone attractive in a passionate or sensual way.
Example
The sultry weather made it hard to focus on work.
C1 verb /sʌlk/

sulk

Meaning
to be silent and bad-tempered because you are angry or disappointed
Example
She sulked in her room after the argument.
B1 noun /ˈsʌb.mə.riːn/

Sub-marine

Meaning
a warship with a streamlined hull designed to operate completely submerged in the sea
Example
The submarine dived deep into the ocean to avoid detection.
B2 noun ˈsæt.əl.aɪt

satellite

Meaning
An artificial object which has been intentionally placed into orbit around a celestial body.
Example
Satellites provide critical data for research.
B2 verb /skoʊld/

scold

Meaning
to criticize angrily; to rebuke
Example
The teacher scolded the students for being late.
C1 verb /ˈsʌkɪŋ/

sucking

Meaning
Drawing in a liquid, air, or other substance through the mouth or a tube by creating a vacuum; also used figuratively for something unpleasant or ineffective
Example
The baby is sucking on a pacifier.
C1 noun /slæɡ/

slag

Meaning
Stony waste matter separated from metals during the smelting process.
Example
The factory dumped the slag near the river.
C1 noun /ʃɑːrd/

shard

Meaning
a broken piece of glass, metal, or pottery
Example
He cut his finger on a shard of glass.
B2 noun /ˈsɛsəmi sidz/

Sesame Seeds

Meaning
small edible seeds from the sesame plant used in cooking and baking
Example
Sprinkle sesame seeds on top of the bread before baking.
C2 noun ˈsaɪəns ˈdezət

science-desert

Meaning
A region or area lacking in scientific development, research facilities, or educational institutions.
Example
J.C. Bose thrived in a science-desert.
B1 verb /stæmp/

stamp

Meaning
To bring down (one's foot) heavily on the ground; to imprint a mark or seal.
Example
She stamped her foot in frustration.
B2 noun /ˈseɡ.mənt/

Segment

Meaning
each of the parts into which something is divided; a section or portion
Example
The orange was divided into eight segments.
C1 noun /sloʊθ/

Sloth

Meaning
laziness; reluctance to work or make an effort
Example
His sloth prevented him from achieving his goals.
A1 noun /ˈʃɒpɪŋ/

shopping

Meaning
the activity of going to shops to buy things
Example
She spent the afternoon shopping for clothes.
A2 noun /staɪl/

Style

Meaning
a particular way of doing something; a distinctive appearance or manner of expression
Example
She has her own unique style of writing that captivates readers.
C1 noun /ˈsæf.aɪər/

Saphire

Meaning
a precious stone that is typically blue in color
Example
The royal crown was adorned with a large sapphire.
C1 verb/noun /ˈsɒldər/

solder

Meaning
To join metal parts together by melting and putting a filler metal into the joint
Example
He soldered the broken wires back together.
B2 verb /ʃɛd/

shed

Meaning
to let something fall off naturally, such as leaves, hair, or tears
Example
Trees shed their leaves in autumn.
C2 noun /sɪˈrɒkoʊ/

sirocco

Meaning
A hot, dry wind blowing from North Africa across the Mediterranean to southern Europe.
Example
The sirocco made the city unbearably hot and dusty.
C2 noun /ˈsiːkənt/

secant

Meaning
A straight line that intersects a curve at two or more points.
Example
In geometry, a secant cuts the circle at two distinct points.
C1 noun ˌsteɪbəlaɪˈzeɪʃən

stabilization

Meaning
The process of making or becoming stable.
Example
The stabilization of the structure was essential after the earthquake.
C1 adjective /ˈsɛm.ɪ.nəl/

seminal

Meaning
Strongly influencing later developments; highly original and influential.
Example
His seminal book changed the course of modern philosophy.
C2 adjective /ˈspɔːrtɪv/

sportive

Meaning
Playful, lively, or full of fun.
Example
The children were in a sportive mood during the picnic.
C2 noun /sfɪˈrɒmɪtər/

spherometer

Meaning
An instrument used for measuring the curvature of spherical surfaces.
Example
The scientist used a spherometer to measure the lens curvature.
C1 adjective /ˈstætʃətɔːri/

statutory

Meaning
Required, permitted, or enacted by law.
Example
The company must comply with all statutory regulations.
A2 adjective /ˈsuːpər/

super

Meaning
excellent; very good
Example
She did a super job on the project.
C1 adjective /ˈspɛərɪŋ/

sparing

Meaning
Using or giving only a little of something; economical.
Example
She is sparing in her use of words.
C1 adjective /stiːpt/

steeped

Meaning
Completely surrounded by or filled with a particular quality, influence, or experience.
Example
The town is steeped in history and tradition.
C2 noun /ˈspɒt.ɪd sneɪk hed/

Spotted snake head

Meaning
a type of freshwater fish with spotted markings and an elongated head resembling a snake
Example
The spotted snake head is a popular fish for aquaculture in South Asia.
B2 adjective /ˈsoʊ.vi.ət/

soviet

Meaning
relating to the Soviet Union or its government
Example
The Soviet era saw significant changes in Eastern Europe.
B1 noun /ˈsoʊ.lər ˌsɪs.təm/

Solar system

Meaning
the sun and all the planets, moons, asteroids and other objects that orbit around it
Example
Our solar system has eight planets orbiting the sun.
B2 noun /ˈsæŋk.tʃuˌɛr.i/

sanctuary

Meaning
A place of safety, refuge, or protection; a sacred place.
Example
The forest is a sanctuary for endangered animals.
A1 adverb /ˈsʌm.taɪmz/

Sometimes

Meaning
at times; occasionally; now and then
Example
Sometimes I go for a walk in the evening.
C1 adjective /steɪd/

staid

Meaning
Serious, respectable, and unadventurous.
Example
He came from a staid family background.
B2 noun /ˈsɪɡ.nəlz/

signals

Meaning
A gesture, action, or sound conveying information or instructions.
Example
Signals from deep space were detected last week.
A2 noun /stres/

stress

Meaning
Physical, mental, or emotional strain or tension.
Example
Excessive stress can lead to health issues.
C2 noun /sɒmˈnæmbjʊlɪst/

somnambulist

Meaning
A person who sleepwalks.
Example
The somnambulist wandered out of the house at night.
C2 verb /skwɛltʃ/

squelch

Meaning
to make a soft sucking sound, such as when walking on mud; to suppress or silence
Example
His boots squelched in the wet ground.
A2 noun /sænd/

sand

Meaning
Small loose grains of crushed rock, found on beaches and deserts.
Example
Children built castles out of sand on the beach.
C1 noun /ˈstrɑːtəm/

stratum

Meaning
a layer or level of material, or a social class in society
Example
The upper stratum of society enjoyed privileges not available to others.
C1 adjective /ˈsʌpl/

supple

Meaning
Easily bending or moving without breaking; flexible and adaptable.
Example
The gymnast’s body was remarkably supple.
C2 adjective /svelt/

svelte

Meaning
Attractively thin, graceful, and elegant in appearance or movement.
Example
She looked svelte in the elegant black dress.
C1 adjective /ˈstraɪ.dənt/

strident

Meaning
loud and harsh; presenting a point of view in a forceful way
Example
His strident voice made the debate uncomfortable.
B2 verb /skriːtʃ/

screech

Meaning
to make a loud, high-pitched and unpleasant sound
Example
The car screeched to a halt.
C1 verb /ˈsɪn.θə.saɪz/

synthesize

Meaning
To combine a number of things into a coherent whole.
Example
Scientists synthesize new compounds for medical research.
B2 noun /ˈsnoʊ.fɔːl/

Snowfall

Meaning
the process of snow falling from the sky; the amount of snow that falls
Example
The heavy snowfall blocked all the roads yesterday.
C1 verb /sərˈmaʊnt/

surmount

Meaning
to overcome a difficulty or obstacle
Example
He surmounted all the challenges to achieve his dream.
C1 adjective /ˌsʌb.təˈreɪ.ni.ən/

subterranean

Meaning
Existing, occurring, or done under the earth's surface.
Example
Subterranean water sources help sustain agriculture.
C1 adjective /ʃrɪl/

shrill

Meaning
High-pitched and piercing in sound.
Example
The shrill whistle startled everyone in the room.
C1 verb /ˈsaɪdˌtræk/

sidetrack

Meaning
To distract from the main subject or activity.
Example
She was sidetracked by an unexpected phone call.
C2 noun /ʃiːt fɪʃ/

Sheat-fish

Meaning
A large freshwater catfish with a broad flat head and long barbels
Example
The sheat-fish is one of the largest freshwater fish in South Asia.
A2 verb /ʃaɪn/

shine

Meaning
to give out a bright light or glow
Example
The sun will shine brightly tomorrow.
B2 adjective /skeərs/

Scarce

Meaning
rare; not easily found; existing in small quantities
Example
Fresh water is becoming increasingly scarce in desert regions.
C1 noun /ˈstɛnsəl/

stencil

Meaning
A thin sheet of material with a design cut out, used to produce the design on the surface below by applying paint or ink through the cut-out holes.
Example
The artist used a stencil to paint identical stars on the wall.
C1 adjective /ˈsɒljʊbəl/

soluble

Meaning
able to be dissolved, especially in water
Example
Sugar is soluble in water.
C2 adjective /sɒmˈnɪfərəs/

somniferous

Meaning
Tending to induce sleep; soporific.
Example
The professor's somniferous lecture put half the class to sleep.
A2 verb /skiː/

ski

Meaning
to glide over snow on skis
Example
We went skiing in the Alps last winter.
B2 adjective /ˈslɪp.ər.i/

Slippery

Meaning
smooth and difficult to hold; causing sliding or slipping
Example
The wet floor was very slippery after cleaning.
B2 noun ˌsænɪˈteɪʃən

sanitation

Meaning
Conditions relating to public health, especially the provision of clean drinking water and adequate sewage disposal.
Example
Good sanitation practices are key to preventing infestations.
C2 adjective /ˈsækərɪn/

saccharine

Meaning
Excessively sweet or sentimental.
Example
His saccharine smile seemed insincere.
C1 noun /ˈsɪlk.wɜːrm/

Silk-worm

Meaning
the caterpillar of a moth that produces silk fibers used to make silk fabric
Example
Silkworms feed on mulberry leaves to produce silk.
B2 adjective /ˈskætərd/

Scattered

Meaning
spread widely apart; dispersed; occurring here and there
Example
Scattered showers are expected throughout the day.
C1 noun /stents/

stents

Meaning
Small mesh tubes used to treat narrow or blocked arteries.
Example
Stents were successfully placed using robotic techniques.
B2 noun /stəˈtɪstɪks/

statistics

Meaning
the practice or science of collecting and analyzing numerical data
Example
The statistics showed an increase in the number of users last year.
B1 adjective /sɪˈlek.tɪd/

selected

Meaning
carefully chosen from a group for a particular purpose
Example
He was one of the selected candidates for the scholarship.
C1 noun /səbˈdʒɛkʃən/

subjection

Meaning
the act of bringing someone or something under control or domination
Example
The people suffered under the subjection of a cruel ruler.
A1 modal verb /ʃʊd/

should

Meaning
used to indicate obligation or duty
Example
You should study for your exams.
B1 adjective /ʃɛrd/

shared

Meaning
used, done, or experienced by two or more people together
Example
They live in a shared apartment near the university.
A2 noun /ʃɛlf/

shelf

Meaning
a flat surface used for storing or displaying things, typically fixed to a wall or inside a cabinet
Example
I placed the books on the shelf next to the window.
C1 noun /sɪˈnɪləti/

senility

Meaning
The state of being old and showing the weaknesses of age, especially mental decline.
Example
His forgetfulness was attributed to senility.
B2 noun /ˈsʌb.sɪ.di/

subsidy

Meaning
Financial assistance provided by government to reduce costs of goods or services.
Example
The government provides a fuel subsidy to control prices.
C1 adjective /ˈstɪndʒi/

stingy

Meaning
unwilling to spend or give; miserly
Example
He is too stingy to buy a gift for his friend.
A1 verb /ˈstʌdi/

study

Meaning
to learn about something; to examine carefully; to research
Example
I study mathematics every evening.
B2 noun /ˈseɪf.ɡɑːrd/

Safeguard

Meaning
measure or action designed to protect someone or something
Example
New safeguards were implemented to prevent data breaches.
C1 noun /ˌsɛnsəˈbɪləti/

Sensibility

Meaning
the ability to appreciate and respond to complex emotional or aesthetic influences; sensitivity
Example
Her artistic sensibility made her appreciate fine details in paintings.
C1 noun/verb /smʌdʒ/

smudge

Meaning
a dirty mark or smear; to make something dirty or unclear by rubbing or touching
Example
She accidentally smudged her lipstick on the napkin.
A1 noun /skuːl/

school

Meaning
An institution for educating children; also a group of people sharing the same ideas or discipline.
Example
The children walked to school together.
C1 noun /skwɔːl/

squall

Meaning
a sudden violent gust of wind, often accompanied by rain, snow, or sleet
Example
A sudden squall caught the sailors off guard.
B2 noun /ˈskaɪˌskreɪpər/

Skyscraper

Meaning
a very tall building of many stories
Example
The new skyscraper dominates the city's skyline.
C1 adjective /səˈdʒɛstɪv/

suggestive

Meaning
tending to suggest ideas or images; sometimes implies something sexual or provocative
Example
The painting was highly suggestive and sparked much debate.
B2 noun /ˈʃuːtɪŋ/

shooting

Meaning
the action of shooting a gun, camera, or similar device
Example
The shooting of the movie took several months.
A2 adverb /ˈsloʊli/

slowly

Meaning
in a slow manner
Example
She walked slowly to the door.
A2 noun /sɛlf/

self

Meaning
a person's essential being that distinguishes them from others, especially considered as the object of introspection or reflexive action
Example
She has a strong sense of self.
C1 noun /ˌsɛlf əˌfɜːˈmeɪʃən/

self-affirmation

Meaning
The practice of affirming one's own worthiness and value as an individual.
Example
Daily self-affirmation can boost your confidence.
B2 adjective /slaɪ/

sly

Meaning
Clever in a deceitful or cunning way.
Example
She gave him a sly smile.
B2 noun /ˈstiː.mər/

Steamer

Meaning
a ship or boat powered by steam engines
Example
The old steamer crossed the river slowly.
B2 adverb /ˈskɪl.fəl.i/

Skilfully/US: Skillfully

Meaning
in a way that shows ability and training; expertly
Example
She skilfully painted the portrait in just two hours.
A1 noun /ˈsændwɪtʃ/

sandwich

Meaning
two pieces of bread with food such as meat, cheese, or salad between them
Example
I made a chicken sandwich for lunch.
B2 verb ˈsiːlɪŋ

sealing

Meaning
The action of closing or blocking something to prevent entry or escape.
Example
Sealing cracks in the walls can prevent pests from entering.
A2 noun /skɜːrt/

Skirt

Meaning
a garment that hangs from the waist and covers part or all of the legs
Example
She chose a blue skirt to match her blouse.
B1 noun /ˈstʌmək eɪk/

stomach ache

Meaning
Pain in the stomach or abdominal area
Example
I have a stomach ache after eating too much.
B2 verb ˈstɪmjəleɪt

stimulate

Meaning
To encourage or promote the development or growth of something
Example
Proper sunlight stimulates plant growth.
C2 noun /ʃiːf/

sheaf

Meaning
a bundle of grain stalks laid lengthwise and tied together after reaping; a bundle of objects tied together
Example
The farmer carried a sheaf of wheat on his shoulder.
C1 verb /ˈstɪp.jʊ.leɪt/

stipulate

Meaning
to demand or specify a condition in an agreement or contract
Example
The contract stipulates that payment must be made within 30 days.
B2 noun /sɪˈver.ə.ti/

Severity

Meaning
the quality of being extremely serious or harsh; intensity of something bad
Example
The severity of the storm caused widespread damage across the city.
A1 noun /sʌn/

Sun

Meaning
the star around which the earth orbits; the source of light and heat for planets
Example
The sun rises in the east and sets in the west.
B1 verb /sɪŋk/

sink

Meaning
to go down below the surface; to descend
Example
The ship sinks in the deep ocean.
C2 noun /ˈstriːmlɪt/

streamlet

Meaning
a small stream; a tiny brook or rivulet
Example
A streamlet flowed through the meadow.
C1 verb /slɪŋ/

sling

Meaning
to throw or hang something roughly or carelessly
Example
He slung his bag over his shoulder before leaving.
B2 noun /ˈsleɪvəri/

slavery

Meaning
the system or state of being owned and forced to work for someone else
Example
Slavery was abolished in most countries in the 19th century.
B2 noun ˈsuː.pər.fuːdz

superfoods

Meaning
Nutrient-dense foods that are particularly beneficial for health and well-being.
Example
Blueberries and spinach are superfoods rich in vitamins.
B2 noun /ˈswɛər wɜːrd/

swear-word

Meaning
An offensive or rude word used to express anger or frustration.
Example
He shouted a swear-word when he hit his toe.
C2 adjective /ˈsæŋɡwɪˌnɛri/

sanguinary

Meaning
Involving or causing much bloodshed; bloodthirsty.
Example
The battle was one of the most sanguinary conflicts of the war.
C1 adjective /ˈsɛreɪtɪd/

serrated

Meaning
Having a notched or saw-toothed edge.
Example
The bread knife had a serrated blade.
B2 noun /spæn/

span

Meaning
the full extent or length of something from one end to another
Example
The bridge has a span of over 500 meters.
A2 verb /səˈpəʊz/

suppose

Meaning
to assume or believe something is true without proof
Example
I suppose she will be here soon.
C2 noun /ˈstrɪndʒənsi/

stringency

Meaning
the quality of being strict, precise, or severe
Example
The stringency of the new rules surprised everyone.
C1 adjective /ˈspraɪtli/

sprightly

Meaning
full of energy and life; lively
Example
The sprightly old man danced with joy at the wedding.
C2 verb /ˈsæŋktɪfaɪ/

sanctify

Meaning
to make holy or sacred; to purify
Example
The priest will sanctify the marriage ceremony.
A2 adjective /sɪk/

Sick

Meaning
unwell; having a disease or illness; feeling nauseous
Example
She stayed home from work because she was feeling sick.
C1 /splɪnt/

splint

Meaning
A rigid device used to support and immobilize a broken or injured body part.
Example
The doctor applied a splint to stabilize the patient's broken arm.
A2 noun /sməʊk/

smoke

Meaning
A visible suspension of carbon or other particles in air, typically one emitted from a burning substance.
Example
Smoke from vehicles worsens air quality.
A2 noun /ˈsɪriz/

Series

Meaning
a number of events, objects, or people of a similar or related kind coming one after another; a set of related television or radio programmes
Example
The detective series ran for five successful seasons.
B2 adjective səˈfɪs.tɪ.keɪ.tɪd

sophisticated

Meaning
Having great knowledge or experience of the world and knowing about fashion, culture, and other things that people think are socially important; highly developed or complex.
Example
Sophisticated designs enhance aesthetics.
C2 noun /slaɪt/

sleight

Meaning
Skill or dexterity, especially in performing tricks.
Example
The magician amazed the crowd with his sleight of hand.
C1 adjective /ˈskrɔːni/

scrawny

Meaning
very thin and bony, often looking unhealthy
Example
The scrawny boy could barely lift the heavy bag.
C2 verb /ˈsɛreɪt/

serrate

Meaning
To make a saw-toothed edge or notched margin.
Example
The craftsman serrated the knife blade for better cutting.
C1 noun /ˈstɒpɪdʒ/

stoppage

Meaning
The act of stopping or ceasing; a halt in operation or activity
Example
The sudden stoppage of the train caused delays for all passengers.
B2 adjective /ˈsoʊpi/

Soapy

Meaning
covered with soap; having the characteristics of soap; foamy
Example
The dishes were still soapy after washing.