Definitions for "backwash"
To clean the oil from (wool) after combing.
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.
The flow of water propelled backward by the propeller, paddle wheel, or oars of a boat.
Keywords:  nme, gosh, twee, talulah, retrospective
Backwash is a retrospective compilation by the group Talulah Gosh. Released on K Records in 1996 (see 1996 in music), it contains all of their single and radio session tracks, plus live versions of three songs of which no studio recordings exist. The compilation falls in the field of twee pop, and it was given the rare 10/10 rating by NME.
Keywords:  rafael, hbo, alvarez, simon, wright
"Backwash" is the seventh episode of the second season of the HBO original series, The Wire. The episode was written by Rafael Alvarez from a story by David Simon & Rafael Alvarez and was directed by Thomas J. Wright.
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"
The disturbed air in the wake of an aeroplane in flight
Keywords:  pogees, silly, scare, knock, him
"Our backwash should knock him silly and scare the pogees out of him." (LP)
A form of backflow which occurs due to negative pressure.