Break a leg
to wish someone good luck
Not my cup of tea
not something one likes or is interested in
In a pickle
in a difficult situation
Piece of cake
it's easy
It costs an arm and a leg
Kick the bucket
to die
an obvious, important, and often uncomfortable issue that people are avoiding discussing or acknowledging
to accept criticism or punishment for something you have done
avoiding an important topic or not speaking directly about something
rarely
By the skin of your teeth
to just barely get by or make it
When pigs fly
Hit the sack/hay
to go to bed
Back to the drawing board
A bad egg
a bad person
Barking up the wrong tree
trying to do something in a way that will not work
Add insult to injury
when a bad situation becomes worse
Don't cry over spilt milk
Don't be upset about something you can't change
We don't see eye to eye
don't agree with someone
Beat a dead horse
to waste effort on something when there is no chance of succeeding
the positive and negative results of a situation or action balance each other
a bit of a dark horse
a person with hidden abilities
A drop in the bucket
something small and unimportant, esp. when compared with something else
Play it by ear
to decide what to do or say as a situation unfolds, rather than acting according to a pre-made plan or preparation
Let sleeping dogs lie
said to warn someone that they should not talk about a bad situation that most people have forgotten about