break your neck
break (one's) neck
To put forth a great deal of effort. I've been breaking my neck trying to get a passing grade this semester, so failing by two measly points is incredibly frustrating. Don't break your neck trying to please these people—they'll never appreciate it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
break your ˈneck (doing something/to do something)(informal) make a great effort: There’s no need to break your neck trying to get here by five. We can always wait for you.
Farlex Partner Idioms Dictionary © Farlex 2017