If you hear something ..., you hear it from the person who is most closely involved.
If you ..., you achieve two benefits from only one action.
cry wolf
If you ..., you enjoy yourself tremendously.
If you ..., you reveal a secret by mistake.
drop like flies
open a can of worms
let the cat out of the bag
escape the rat race
straight from the horse's mouth
kill two birds with one stone
If you do something ..., you do it for a very long time.
If you ..., you ask for help when you don't really need it.
until the cows come home
If you feel ..., you are having problems because you're in an unfamiliar environment.
If you are ...., somebody is angry with you.
If you ..., you accidentally cause a situation to become more complicated and difficult.
like a fish out of water
have a whale of a time
If you ..., you change your way of life so that you have more freedom and less stress.
in the dog house
If people ..., they become ill in large numbers.