grow a set
v. phr.— «Look, WTR, you’re going to have to grow a set. You’ve gone from stare-and-glare to nodding, but you won’t get anywhere else if you don’t have the balls to walk up to him and introduce yourself.» —“Savage Love” by Dan Savage Village Voice (New York City) May 16, 2006. (source: Double-Tongued Dictionary)