From Wiktionary, the free dictionary
Deverbal from clean out.
cleanout (plural cleanouts)
- An opening or drain leading into a plumbing system to provide a location to insert a snake or other implement for cleaning.
- Coordinate term: drainout
- A thorough cleaning that removes everything removable.
- Coordinate terms: clearance, clearout
attic, basement, and garage cleanouts [in advertisements]
- (informal) An enema.
