/kleen"up'/ , n.
1. the act or process of cleaning up.
2. Slang. a very large profit: The company made a real cleanup on their new invention.
3. Baseball.
a. the fourth position in the batting order: Our best home-run hitter is batting cleanup.
b. the player who bats in this position.
[ 1865-70, Amer.; n. use of v. phrase clean up ]