break cover

big break

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

blow someone's cover

To reveal that someone's behavior, situation, or identity has been fabricated or deliberately misrepresented for an ulterior motive.

break a leg

Good luck!; Do your best!; Said to someone wishing they perform well in a theatrical production or comparable endeavor.

break a sweat

To put effort into something.

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.