Definitions
1.nounThe backward flow of water from oars or propeller or breaking waves.
2.nounThe similar flow of air from an aircraft engine.
3.nounThe result or consequence of an event; an aftermath.
4.nounThe saliva, spit or food particles that have flowed back into a drink after someone has drunk from it.
5.verbTo operate a water filter in the reverse direction in order to clean it.
6.verbTo affect with backwash.
7.verbTo clean the oil from wool after combing.