FIGHT TOOTH AND NAIL

FIGHT USING ALL RESOURCES AT YOUR DISPOSAL


e.g.

You've been fighting tooth and nail for a place in show business with no success.

or

I'm gonna fight tooth and nail to keep him here because I think he's an outstanding coach.

http://www.bruinsnation.com/ucla_recruiting/2015/2/4/7982891/ucla-coach-mora-im-gonna-fight-tooth-and-nail-to-keep-ulbrich?_ga=1.71341971.1653098927.1445733828