Caught red handed - Being caught in the act.

Kick the bucket - Died.

Don't throw out the baby with the bathwater - Don't eliminate what is good when trying to get rid of something bad.

Break a leg - Good luck!

Cat got your tongue? - Asked when someone is unusually quiet.

Wrap your head around it - Understanding a difficult concept.

Put a sock in it - Stop talking.

Storm in a teacup - Much ado about nothing.

All mouth, no trousers - All talk.

Give the cold shoulder - To ignore someone intentionally.