break into a run

big break

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

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 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.