Lighten up
to relax
Blow off steam or let off steam
to do or say something to get rid of strong emotions
Under the weather
to feel sick
Piece of cake
really easy
Walking on egg shells
Being very careful
Are you pulling my leg?
Are you messing with me?
To burst into tears
to suddenly start to cry.
Go back to the drawing board
to start over
Raining cats and dogs
raining really hard
hold your horses
slow down
To see red
This idioms means to get really angry.
Call it a day
to decide to stop doing something
Wrap your head around something
to fully understand something
Get a grip
to get control over your emotions.
Keep a Straight Face
to try not to smile or laugh.
Lose your head
to lose control of your emotions.
Break a leg
Good luck
Cost an arm and a leg
being extremely expensive
A picture is worth a thousand words
better to show than tell
to show your feelings, especially your love for someone.