I hope the show is going well tonight.  Break a leg!

There is only 1 more show, tomorrow afternoon.  I hope that is fantastic!!  Break a leg again!

What type of figure of speech is "break a leg"?  Does it mean to literally break your leg.  I hope not as I just wished our actors and actresses would break their leg in the show tonight and tomorrow.  Yikes!  Blog a comment that explains what I mean or tells what type of figurative language that is and you can have 4 tickets Monday.

How many ticket opportunities are on the blog tonight?  Wow, I must be feeling generous.