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2
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100
A fish out of water

To feel awkward or uncomfortable

100

Happy Camper

A happy/cheerful person

100

Sit tight

To stay right where you are

100

Hit the books

To study hard

200

Up in the air

To be undecided or unsure

200
To be broke

To have no money

200

To get the ball rolling

To get started

200

Rule of thumb

An unwritten guideline/rule
300

To keep an eye on you

To watch someone closely/carefully

300

Cold shoulder

To ignore someone

300

All in the same boat

To take part in the same situation as the people you are with
300

Let the cat out of the bag

To accidentally tell a secret 

400

In the dog house

To be in a situation where someone is mad at you

400

On thin ice

To be in a risky situation that could have serious consequences 

400

It takes two to tango

Both people involved in a situation are responsible for it

400

Crying over split milk

To be upset over something that has already happened

500

Put your foot in your mouth

to say or do something embarrassing
500

To bite off more than you can chew

to take a commitment or make a promise you cannot keep

500

Preaching to the choir

to present an argument or opinion to someone who already agrees with it

500

Put all your eggs in one basket

to put all your effort into one thing and if it fails you have no alternative (no other option)

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