backwash

v. t.	1.	To clean the oil from (wool) after combing.
	2.	(Chem.) To clean (a filter, a chromatography column, a water softener, etc.) by passing liquid through in the reverse of the normal direction of flow. This procedure dislodges particles which clog the pores of the filter or column packing, removing them from the filter or column.
n.	1.	The flow of water propelled backward by the propeller, paddle wheel, or oars of a boat.
	2.	(Aeron.) The backward flowing air within the wash of an airplane, caused mostly by the engine.

Noun	1.	backwash - the flow of air that is driven backwards by an aircraft propeller Synonyms: slipstream, airstream, race, wash
	2.	backwash - the consequences of an event (especially a catastrophic event); "the aftermath of war"; "in the wake of the accident no one knew how many had been injured" Synonyms: aftermath, wake
	3.	backwash - the wave that spreads behind a boat as it moves forward; "the motorboat's wake capsized the canoe" Synonyms: wake

Charybdis, Maelstrom, back stream, backcountry, backflow, backlash, backwater, backwoods, boondocks, bush, clout, condensation trail, contrail, countercurrent, counterflow, counterflux, eddy, exhaust, force, gulf, gurge, hinterland, impact, impress, impression, imprint, maelstrom, mark, print, reaction, recoil, reflex, refluence, reflux, regurgitation, repercussion, response, sticks, stream, swirl, track, twirl, up-country, vapor trail, vortex, wake, wash, whirl, whirlpool