break a leg

an arm and a leg

Usually used after the verb cost, but also often charge, pay, and spend: a very high price for an item or service; an exorbitant price

big break

A breakthrough, especially the first big hit of a previously unknown performer or performers in the entertainment industry.

break a sweat

To put effort into something.

break cover

To disclose one's real thoughts and intentions.

break down

To give in or give up: relent, concede, surrender.

break even

To neither gain nor lose money.

break gates

To enter an Oxford or Cambridge college enclosure after the hour to which a student has been restricted.

break in

To reach a state of functioning more smoothly through use or wear; to cause (something, or someone, new) to undergo this change.