break a leg

I was 4 months old when they had to break my legs.

And I'd like to see you try to break my legs.

The guys who've been coming around looking for him are the sort who break legs.

Now would be just the time to break a leg.

We could break your leg and no one would care.

If you break your leg don't come running here to me.

"Now the common people want to break my legs because I spoke for the government."

I couldn't find anything about the boy whose legs I'd broken.

"I can't get us out of here if you break your leg or something."

He is worried that people are going to break his legs.