Common call for cast?! (5,1,3)
I believe the answer is:
break a leg
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for break a leg that I've seen before include "Do something that requires surgery" , "Actors' good luck" , "Thespian's good luck! (slang)" , "Good luck in the theatre!" , "leading to member being in cast?" .)