open a Pandora’s box
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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.
idiom

off the beaten path

Meaning
doing something unusual or original
Example
Her ideas are always **off the beaten path**.
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

old friends are gold

Meaning
old friends are precious and valuable
Example
I always say, **old friends are gold**.
idiom

off script

Meaning
to deviate from a prepared plan or speech
Example
During the meeting, he went **off script** and made some bold statements.
idiom

open channels of communication

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

out of the woods

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

Out of one’s depth

Meaning
To be in a situation that is too difficult to understand or deal with.
Example
I felt **out of my depth** in that technical discussion.
idiom

on top of the world

Meaning
to feel extremely happy and successful
Example
After winning the award, he felt **on top of the world**.
idiom

on the stand

Meaning
testifying as a witness in court
Example
She was nervous when she was **on the stand**.
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

over the moon

Meaning
extremely pleased or happy
Example
She was **over the moon** when she won the prize.
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

on the big screen

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

on fire

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

own your mistakes

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

overnight success

Meaning
a person or thing that becomes successful very quickly
Example
Her first song made her an **overnight success**.
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**.
phrasal-verb

open within

Meaning
to connect with your inner emotions and understand yourself better
Example
Yoga helps me to **open within** and feel peaceful.
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 up to differences

Meaning
to accept and appreciate diversity
Example
Children should learn to **open up to differences** from an early age.
phrasal-verb

open up about kindness

Meaning
to speak honestly about acts of kindness or gratitude
Example
He finally **opened up about kindness** he received from strangers.
idiom

out of the frying pan into the fire

Meaning
to go from a bad situation to a worse one
Example
Leaving that job was like jumping **out of the frying pan into the fire**.
phrasal-verb

open up trade routes

Meaning
to create new paths for international exchange of goods
Example
They are negotiating to **open up trade routes** with neighboring countries.
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 cue

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

out of the box

Meaning
creative and different from usual ideas
Example
Her **out of the box** marketing strategy increased sales rapidly.
idiom

On the clock

Meaning
Working, often with a strict time limit or deadline.
Example
I’m **on the clock** today, so I can’t waste any time.
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**.
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.
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.
idiom

on the house

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

out of this world

Meaning
extremely good or impressive
Example
The food at that restaurant is **out of this world**.
idiom

out with the old, in with the new

Meaning
to replace old things or ideas with new ones
Example
It's time for **out with the old, in with the new**.
idiom

off the top of one's head

Meaning
to say something without thinking carefully or checking
Example
**Off the top of my head**, I think there are five options.
idiom

Open book

Meaning
Someone who is easy to understand or transparent.
Example
She’s an **open book**; you always know what she’s thinking.
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

on your shoulders

Meaning
used when someone has responsibility for something
Example
The success of this plan rests **on your shoulders**.
phrasal-verb

open up new perspectives

Meaning
to help someone see things in a new or different way
Example
Traveling to different countries can **open up new perspectives** on life.
idiom

offbeat

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

open up to challenges

Meaning
to be willing to face or accept difficult situations with confidence
Example
If you want to grow, you must **open up to challenges** instead of avoiding them.
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 focus

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

open up markets

Meaning
to make trade or business opportunities available; to remove barriers to trade
Example
The trade agreement helped **open up markets** for local exporters.
idiom

over it

Meaning
no longer interested or affected by something
Example
I'm totally **over it** now.
idiom

on the fast track

Meaning
advancing quickly in a career or project
Example
He is **on the fast track** to becoming a manager.
phrasal-verb

open the lines of communication

Meaning
to start talking again after a period of silence
Example
She wanted to **open the lines of communication** with her best friend again.
phrasal-verb

open toward

Meaning
to show warmth or acceptance toward someone
Example
He became more **open toward** his classmates.
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

on the tip of one's tongue

Meaning
when you can almost remember something but not quite
Example
His name is **on the tip of my tongue**, but I can’t recall it.
idiom

on the up and up

Meaning
honest; truthful; not involved in any wrongdoing
Example
She’s always been **on the up and up** with me.
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 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.
idiom

on good terms

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

old flame

Meaning
a person one had a romantic relationship with in the past
Example
He met his **old flame** at the reunion.
phrasal-verb

owe to

Meaning
to feel you should thank someone for something
Example
I **owe my success to** my parents’ support.
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

offstage

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

opt in

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

on your last legs

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

Old school

Meaning
Having traditional ideas or values; not modern
Example
My father still prefers handwritten letters; he’s really **old school**.
idiom

out of the blue

Meaning
unexpectedly or without warning
Example
My old friend called me **out of the blue** after ten years.
phrasal-verb

open yourself to experiences

Meaning
to be willing to try new cultural activities or perspectives
Example
When you **open yourself to experiences**, you grow beyond your comfort zone.
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

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

offline mode

Meaning
a state of being disconnected from the internet or unavailable
Example
He’s been in **offline mode** all weekend, not answering any messages.
idiom

on the stump

Meaning
to campaign for political office, especially by giving speeches in public
Example
The candidate has been **on the stump** for weeks, rallying support across the country.
idiom

once in a blue moon

Meaning
very rarely
Example
I only see him **once in a blue moon**.
phrasal-verb

open with

Meaning
to begin something by doing or saying something specific
Example
He **opened with** a personal story to connect with the audience.
idiom

on trial

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

open out of yourself

Meaning
to express your true feelings freely; to become emotionally available
Example
It's healthy to **open out of yourself** when you're feeling overwhelmed.
idiom

on your plate

Meaning
something that is your responsibility or job to handle
Example
I have too much **on my plate** right now with all the projects.
idiom

out of memory

Meaning
unable to think clearly; mentally exhausted
Example
After working all night, I was completely **out of memory**.
idiom

on thin ice

Meaning
in a risky or dangerous situation
Example
You are **on thin ice** with that behavior.
idiom

on the spot

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

on the ball

Meaning
alert, smart, and quick to react
Example
You need to be **on the ball** to handle this job.
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.
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.
idiom

on the fence

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

out of shape

Meaning
to be unfit or unhealthy due to lack of exercise
Example
I’m so **out of shape** after sitting at a desk all day.
phrasal-verb

open yourself up

Meaning
to make yourself emotionally vulnerable or honest
Example
It’s hard to **open yourself up** after being hurt.
phrasal-verb

offer help

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

out of sorts

Meaning
feeling slightly unwell or upset
Example
He’s been **out of sorts** since he caught that cold.
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.
idiom

on the grapevine

Meaning
to hear gossip or rumor indirectly
Example
I heard **on the grapevine** that they’re getting divorced.
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

own up

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

out of bounds

Meaning
not allowed or beyond acceptable limits
Example
His rude comment was **out of bounds**.
phrasal-verb

open up over

Meaning
to share personal thoughts because of a particular topic
Example
She finally **opened up over** her anxiety during group coaching.
idiom

old buddy old pal

Meaning
An affectionate way to refer to a longtime friend.
Example
Hey **old buddy old pal**, long time no see!
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 market

Meaning
available for sale
Example
Their house has been **on the market** for over six months.
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.
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 up to peace

Meaning
to allow yourself to feel inner calmness
Example
Through meditation, I’ve learned to **open up to peace**.
idiom

on the horizon

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

opt out of

Meaning
to choose not to participate in something
Example
You can **opt out of** the newsletter at any time.
idiom

On the record

Meaning
Officially stated and reportable
Example
She made her statement **on the record** during the interview.
idiom

on the warpath

Meaning
very angry and likely to argue or fight
Example
She was **on the warpath** after hearing the bad news.
idiom

on the level

Meaning
honest and sincere; not trying to deceive
Example
You can trust her—she’s **on the level**.
idiom

on the radar

Meaning
something that is being monitored or considered
Example
The new scientific theory is now **on the radar** of researchers across the world.
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

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

olive branch

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

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

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

on the right side of the law

Meaning
acting legally; not breaking any laws
Example
He wants to stay **on the right side of the law**.
phrasal-verb

open through

Meaning
to access understanding by going through experiences of another culture
Example
You can **open through** empathy to truly understand cultural values.
idiom

Out of fashion

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