backwash

Meanings

1. A backward flow of water, as from oars, a propeller, breaking waves, etc.
2. The similar flow of air from an aircraft engine.
3. The result or consequence of an event; an aftermath.
4. The saliva, spit or food particles that have flowed back into a drink after someone has drunk from it.
5. The situation where economic growth in one area harms other areas by attracting people and business away from those areas.
6. An obscure place; a backwater.
7. Synonym of washback.

1. To operate a water filter in the reverse direction in order to clean it.
2. To affect with backwash.
3. To clean the oil from wool after combing.

Etymology

From back + wash.