get busy

Start working, become active, as in Stop dawdling; get busy, or We'd better get busy on this paper. [c. 1900] Also see get a move on; get going; get on the stick.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.