I am pulling your leg: you are making joke

It cost an arm and leg: expensive or exorbitant


You have not got a leg to stand on: Can not prove it

To have a whale of a time: to enjoy something very much


Pigs might fly/when pigs fly : that will never happen

"‘Maybe he's trying to change.’ ‘And pigs might fly.’"

Get off your high horse: stop behaving in a superior manner

To be in the doghouse: to be in trouble

Hold your horses: wait be patient