YOU CAN’T MAKE AN OMELETTE WITHOUT BREAKING EGGS
This idiom means that in order to achieve something or make progress, there are often losers in the process.
YOU COULD HAVE KNOCKED ME DOWN WITH A FEATHER
This idiom is used to mean that the person was very shocked or surprised.
YOU SCRATCH MY BACK AND I’LL SCRATCH YOURS
This idiom means that if you do something for me, I’ll return the favour.