- clean-up (n.)
[clean-up 词源字典]
- also cleanup, 1856, "act of cleaning up," from clean + up. Meaning "a profit" is recorded from 1878. Verbal phrase clean up "make a large profit" is from 1929. The adjective, in the baseball sense, is recorded by 1910.[clean-up etymology, clean-up origin, 英语词源]