overfitting
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All Types idiom phrasal-verb proverb
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All Expression Cards All Expressions
idiom

overfitting

Meaning
when a model performs well on training data but poorly on unseen data
Example
The model seems to be **overfitting** because it performs well on the training data but poorly on the test set.
idiom

on the same page

Meaning
to agree or have the same understanding about something
Example
Before we continue, let’s make sure we’re **on the same page**.
idiom

On the drawing board

Meaning
In the planning or design stage
Example
The new product is still **on the drawing board**, but it will be launched next year.
phrasal-verb

open out with

Meaning
to start being honest and expressive with someone about emotions
Example
She **opened out with** her husband about her anxiety.
phrasal-verb

open with gratitude

Meaning
to start a conversation or message by expressing thanks
Example
She **opened with gratitude** before discussing the main issue.
idiom

out of the box thinking

Meaning
thinking in a new, innovative, or creative way
Example
The solution requires **out of the box thinking** from all team members.
phrasal-verb

open your heart to

Meaning
to express love, trust, or care freely
Example
It’s important to **open your heart to** those who care about you.
phrasal-verb

open out

Meaning
to become more confident, relaxed, and expressive emotionally
Example
He started to **open out** after making new friends at work.
idiom

open-hearted

Meaning
kind and honest in expressing feelings
Example
She is an **open-hearted** person who always listens.
idiom

on trial

Meaning
being tested or judged
Example
The company is **on trial** for violating privacy laws.
idiom

on the spot

Meaning
to make a decision immediately
Example
He was asked to decide **on the spot**.
idiom

off the top of my head

Meaning
without much thought or preparation
Example
Off the top of my head, I’d say we need more time.
idiom

once in a while

Meaning
sometimes, but not very often
Example
I enjoy eating out **once in a while**, but I prefer home-cooked meals.
phrasal-verb

open relations with

Meaning
to start official or friendly relations with another country
Example
After years of tension, the two countries agreed to **open relations with** each other.
idiom

Open a can of worms

Meaning
To start something that creates many new problems.
Example
By questioning the policy, he **opened a can of worms**.
idiom

on the witness stand

Meaning
to be giving testimony in court
Example
The victim was nervous while **on the witness stand**.
idiom

on the sly

Meaning
secretly; in a sneaky way
Example
He met her **on the sly** without telling anyone.
idiom

On a shoestring budget

Meaning
To live or do something with very little money.
Example
They traveled across Asia **on a shoestring budget**.
phrasal-verb

open up inside

Meaning
to become emotionally available to yourself and recognize your true emotions
Example
When he learned to **open up inside**, he finally stopped hiding his pain.
phrasal-verb

open your mind to

Meaning
to start considering or accepting new ideas or opinions
Example
Studying anthropology can help you **open your mind to** cultural diversity.
phrasal-verb

open emotionally to

Meaning
to allow emotional vulnerability and express real feelings to someone
Example
It’s hard for him to **open emotionally to** others after being hurt.
phrasal-verb

own your progress

Meaning
to take pride in and acknowledge your personal growth
Example
You should **own your progress** and celebrate every small win.
idiom

Out of focus

Meaning
Not clear or not paying attention
Example
He looked tired and completely **out of focus** during the meeting.
idiom

open to abuse

Meaning
liable to be misused or exploited
Example
Facial recognition technology is **open to abuse** if not regulated.
idiom

on the cutting block

Meaning
being considered for elimination or discontinuation
Example
Due to budget cuts, several research projects are now **on the cutting block**.
idiom

on the same wavelength

Meaning
to think in a similar way as someone else
Example
My best friend and I are always **on the same wavelength**.
phrasal-verb

opt against

Meaning
to decide not to choose a particular option
Example
After considering the risks, the company **opted against** the merger.
idiom

out like a light

Meaning
to fall asleep very quickly
Example
He was **out like a light** as soon as his head hit the pillow.
idiom

old friend

Meaning
a friend you have known for a long time
Example
I met an **old friend** from college yesterday.
idiom

on your own shoulders

Meaning
to be responsible for something yourself
Example
The success of this event rests **on your own shoulders**.
phrasal-verb

open yourself up to feedback

Meaning
to be willing to receive and accept constructive criticism
Example
To grow, you need to **open yourself up to feedback** from others.
phrasal-verb

open the heart to

Meaning
to express your honest emotions to someone
Example
He finally **opened his heart to** his parents.
idiom

over the hill

Meaning
past one's prime; no longer young or at peak performance
Example
Some people think turning forty means you’re **over the hill**, but that’s not true.
idiom

on air

Meaning
broadcasting live; being aired on television or radio
Example
The radio show will be **on air** from 7 to 9 PM.
phrasal-verb

open hearts to

Meaning
to show kindness and acceptance toward people of other cultures
Example
We should **open our hearts to** people who are different from us.
idiom

Out of the frying pan and into the fire

Meaning
Going from a bad situation to an even worse one.
Example
Quitting that job put him **out of the frying pan and into the fire**.
phrasal-verb

open up communication

Meaning
to start or improve honest and clear communication
Example
They tried to **open up communication** to solve their issues.
idiom

own up to

Meaning
to admit or confess to something you did wrong
Example
She finally **owned up to** breaking the vase.
phrasal-verb

offer help

Meaning
to volunteer to assist someone kindly
Example
It’s thoughtful to **offer help** when someone is struggling.
idiom

open and shut case

Meaning
a case that is easily decided or obvious
Example
It was an **open and shut case** with clear evidence.
idiom

open up

Meaning
to become willing to share thoughts or to start operating
Example
He finally **opened up** about the challenges he’s facing.
idiom

out of balance

Meaning
to feel mentally or emotionally unstable
Example
Lack of rest can make you feel **out of balance**.
idiom

on the fence

Meaning
undecided or unsure about something
Example
She’s still **on the fence** about moving abroad.
phrasal-verb

open eyes to

Meaning
to make someone realize or become aware of something important
Example
The film **opened people’s eyes to** the struggles of the poor.
idiom

on the cutting edge

Meaning
at the forefront of innovation or technology
Example
The laboratory is **on the cutting edge** of artificial intelligence research.
idiom

on the horizon

Meaning
likely to happen soon
Example
A new product launch is **on the horizon**.
phrasal-verb

open up opportunities

Meaning
to create new chances or possibilities for learning or connection
Example
Understanding other cultures can **open up opportunities** for collaboration.
idiom

on good terms with

Meaning
having a friendly and positive relationship with someone
Example
She’s **on good terms with** her ex-husband for the kids’ sake.
idiom

out of the woods

Meaning
no longer in danger or difficulty
Example
She’s recovering now, so she’s **out of the woods**.
idiom

on the money

Meaning
exactly correct or accurate
Example
His prediction about the stock was **on the money**.
idiom

on your last legs

Meaning
completely exhausted or near collapse
Example
After working 18 hours straight, I was **on my last legs**.
idiom

on the right track

Meaning
to be going in the correct direction to achieve success
Example
Your plan sounds great — you’re **on the right track**.
idiom

on cue

Meaning
exactly at the right moment
Example
The dog barked **on cue** when the actor opened the door.
idiom

On the breadline

Meaning
Living in poverty or with very little money.
Example
After losing his job, he was almost **on the breadline**.
idiom

open the floodgates

Meaning
to allow something to happen on a large scale; to trigger a chain reaction
Example
When the security flaw was leaked, it **opened the floodgates** for hackers worldwide.
idiom

own up to your mistakes

Meaning
to admit that you have done something wrong
Example
It takes courage to **own up to your mistakes**.
idiom

Out of curiosity

Meaning
Because of a desire to know or learn something.
Example
I asked him **out of curiosity**, not to interfere.
phrasal-verb

open up to others

Meaning
to share thoughts and feelings with people from other cultures
Example
When you **open up to others**, you start to understand their perspectives better.
idiom

over the horizon

Meaning
something that is expected to happen soon
Example
A big change in the market may be **over the horizon**.
idiom

out of orbit

Meaning
beyond control; off the usual path
Example
The project went **out of orbit** after the manager left.
idiom

off the cuff

Meaning
to speak or perform without preparation
Example
He gave an **off the cuff** remark that impressed everyone.
phrasal-verb

open communication with

Meaning
to establish an honest and transparent exchange of thoughts and feelings
Example
Couples should **open communication with** each other to avoid misunderstandings.
idiom

own up to something

Meaning
to admit or confess responsibility for something
Example
You should **own up to your mistakes** instead of blaming others.
phrasal-verb

open oneself to

Meaning
to allow oneself to experience or understand new ideas or cultures
Example
Living abroad helped him **open himself to** diverse ways of life.
phrasal-verb

open dialogue with

Meaning
to start conversations or discussions with another culture or group
Example
The organization aims to **open dialogue with** minority communities.
idiom

off the beaten track

Meaning
in a place not visited by many people; remote or unusual
Example
We found a lovely beach **off the beaten track**.
phrasal-verb

open up new horizons

Meaning
to create new opportunities for learning or understanding different cultures
Example
Studying abroad can **open up new horizons** for personal and cultural growth.
phrasal-verb

open your heart

Meaning
to become more emotionally available or loving
Example
She decided to **open her heart** to love again.
idiom

one in a million

Meaning
very special or rare
Example
Her kindness makes her **one in a million**.
idiom

on the rocks

Meaning
in trouble or likely to fail (especially a relationship or marriage)
Example
Their marriage is **on the rocks** after constant arguments.
idiom

open Pandora’s box

Meaning
to start something that causes many unforeseen problems
Example
Creating sentient AI could **open Pandora’s box** of ethical challenges.
idiom

old friends are gold

Meaning
old friends are precious and valuable
Example
I always say, **old friends are gold**.
phrasal-verb

open access to opportunities

Meaning
to make education, jobs, or services available to more people
Example
Digital transformation helps **open access to opportunities** globally.
idiom

Old hat

Meaning
Something that is outdated or no longer interesting
Example
That style is **old hat** now—no one wears it anymore.
idiom

own up

Meaning
to admit or confess to something.
Example
He finally **owned up** to breaking the vase.
idiom

on the rebound

Meaning
starting a new relationship soon after a breakup
Example
He started dating again **on the rebound**.
idiom

on the world stage

Meaning
in the international arena or community
Example
The country's economy is now strong **on the world stage**.
idiom

out of harm’s way

Meaning
To be safe from danger or difficulty.
Example
Make sure the children are **out of harm’s way** before lighting the fire.
idiom

own your mistakes

Meaning
to take responsibility for what you did wrong.
Example
It’s important to **own your mistakes** and learn from them.
idiom

Out of fashion

Meaning
No longer trendy or popular
Example
Those jeans went **out of fashion** years ago.
phrasal-verb

open out to

Meaning
to become more receptive or welcoming toward new cultures or experiences
Example
Traveling helped her **open out to** different perspectives.
phrasal-verb

open onto

Meaning
to lead to a place or opportunity for connection
Example
This conversation could **open onto** a deeper understanding between us.
idiom

opt out

Meaning
to choose not to participate
Example
Employees can **opt out** of the program if they want.
idiom

on fire

Meaning
performing very well; full of energy and success
Example
The sales team is **on fire** this month!
idiom

on the run

Meaning
trying to avoid being caught by the police
Example
The suspect has been **on the run** for three days.
idiom

on all fours

Meaning
crawling on hands and knees
Example
The baby moved **on all fours** across the floor.
phrasal-verb

open yourself emotionally

Meaning
to allow yourself to feel and express emotions freely
Example
It's not easy to **open yourself emotionally** after being hurt.
idiom

offbeat

Meaning
unusual; different from the norm
Example
His **offbeat** sense of humor makes everyone laugh.
idiom

opt in

Meaning
to choose to participate
Example
Employees can **opt in** to the wellness program.
idiom

own the mistake

Meaning
to take responsibility for doing something wrong
Example
A good leader knows how to **own the mistake** and learn from it.
idiom

on the rise

Meaning
increasing or growing in value or number
Example
Tech stocks are **on the rise** this quarter.
phrasal-verb

open up to trade

Meaning
to start allowing international trade or economic exchange
Example
Many developing nations are trying to **open up to trade** to attract foreign investment.
phrasal-verb

open doors to

Meaning
to create opportunities for cultural connection or understanding
Example
Cultural exchange programs **open doors to** meaningful friendships worldwide.
phrasal-verb

open minds through dialogue

Meaning
to encourage understanding between cultures by communicating openly
Example
The conference aimed to **open minds through dialogue** between communities.
idiom

open channels of communication

Meaning
to establish dialogue or discussion
Example
They tried to **open channels of communication** with the neighboring country.
idiom

olive branch

Meaning
a gesture of peace or reconciliation
Example
The president extended an **olive branch** by inviting his rival to the summit.
idiom

out for blood

Meaning
to be extremely determined to defeat or punish someone
Example
After losing last time, the team is **out for blood** this season.
idiom

off the hook

Meaning
to be free from blame or responsibility for something
Example
He was **off the hook** after his friend confessed.
phrasal-verb

open up to change

Meaning
to become willing to accept new ideas or practices
Example
Societies progress when people **open up to change**.
idiom

on good terms

Meaning
to have a friendly and peaceful relationship
Example
They are still **on good terms** even after the breakup.
idiom

off the rails

Meaning
to become uncontrolled or chaotic
Example
After his friend moved away, his life went **off the rails**.
idiom

off the air

Meaning
no longer being broadcasted
Example
The show went **off the air** after ten years.
idiom

on the front line

Meaning
directly involved in the most active or dangerous part of something
Example
Doctors were **on the front line** during the pandemic.
idiom

One step at a time

Meaning
Handle tasks gradually and not all at once.
Example
Don't stress, just take **one step at a time**.
idiom

on the big screen

Meaning
appearing in a cinema film
Example
Her novel was adapted **on the big screen** last year.
idiom

open a Pandora’s box

Meaning
to start something that causes many unexpected problems
Example
Unregulated AI development may **open a Pandora’s box** of ethical issues.
phrasal-verb

open up emotionally

Meaning
to allow others to see your feelings or emotional state
Example
He started to **open up emotionally** after therapy.
idiom

online presence

Meaning
the existence and activity of a person or business on the internet
Example
A strong **online presence** is essential for digital marketing.
idiom

on the house

Meaning
free of charge; paid for by the establishment
Example
The drinks were **on the house** tonight.
phrasal-verb

own the mistake quickly

Meaning
to admit an error right away
Example
I **own the mistake quickly** and explain the fix to my team.
phrasal-verb

open up space for joy

Meaning
to make emotional room for happiness after pain
Example
After forgiving herself, she began to **open up space for joy**.
idiom

Out of sight, out of mind

Meaning
People or things forgotten when not visible or present.
Example
After moving away, our friendship faded—**out of sight, out of mind**.
idiom

offstage

Meaning
outside of public attention or in private life
Example
He is very different **offstage** than he appears in his shows.
idiom

on shaky ground

Meaning
in an uncertain or unstable situation
Example
His business is **on shaky ground** after the market crash.
phrasal-verb

open up with

Meaning
to start a conversation by being honest or expressive about feelings
Example
He chose to **open up with** a personal story to make others feel comfortable.
idiom

on the gravy train

Meaning
to be in a situation where one makes a lot of money with little effort
Example
He’s been riding **on the gravy train** since he took over the family business.
phrasal-verb

opt for

Meaning
to choose one thing instead of another
Example
We decided to **opt for** the smaller but cheaper apartment.
idiom

out of left field

Meaning
something unexpected or surprising
Example
His question came **out of left field** and shocked everyone.
idiom

out of one’s comfort zone

Meaning
doing something unfamiliar or challenging
Example
She stepped **out of her comfort zone** to take a new job.
idiom

out of one’s mind

Meaning
crazy or extremely worried
Example
He must be **out of his mind** to drive so fast in the rain.
phrasal-verb

open up to feedback

Meaning
to be willing to listen and accept constructive criticism
Example
A good leader must **open up to feedback** from the team.