In hot water.
To be fine.
To be in trouble.
Shake a leg!
Hurry up!
Slow down!
On Cloud 9
To be very happy/excited.
To be very sad/angry.
Penny for your thoughts.
Ask what someone is saying.
Ask what someone is thinking.
Let the cat out of the bag!
Reveal a secret.
Keep a secret.
Bite off more than you can chew.
To do very little work.
To do too much work.
In the nick of time.
The name of time.
Just in time, the last moment.
Under the weather.
Feeling sick.
Feeling good.
Ants in your pants!
Uncomfortable
Comfortable
Bite the bullet.
To be brave.
To run away.
The 800 pound gorilla
The weakest person in a situation.
The strongest person in a situation.
A piece of cake.
Very difficult.
Very easy.
Icing on the cake.
Make something worse.
Make something better.
Cost an arm and a leg.
To be very expensive.
To be expensive.
Time flies.
Time passes quickly.
Time passes slowly.
Hit the nail on the head.
To solve a problem.
To make a problem.
A fish out of water.
To feel very good.
To feel uncomfortable.
It's raining cats and dogs.
Light rain.
Heavy rain.
Spill the beans.
To tell a secret.
To keep a secret.
Break The Ice.
Start a conversation.
End a conversation.