Break the ice. We could break the ice and go say Hi!
do something to relieve the tension
A piece of cake. The test was a piece of cake!
Easy
Call it a day. I'm going to call it a day!
go to bed
Costs an arm and a leg! Those shoes cost an arm and a leg!
Expensive
See eye to eye. My sister and I don't see eye to eye on much.
have similar views on something
Under the weather. I feel under the weather today.
sick
Break a leg! I told my sister to break a leg before her audition.
Good luck
Bite the bullet. I'm going to bite the bullet and put in a pool!
Go ahead and do something
Chicken. I was a chicken to go into the house.
scared
Hit the sack! Its time to hit the sack!
Go to bed