definition of
backwash

[1] #1 backwash n. [slipstream, airstream, race, wash] the flow of air that is driven backwards by an aircraft propeller. wn

[2] #2 backwash n. [aftermath, wake] 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". wn

[3] #3 backwash n. [wake] the wave that spreads behind a boat as it moves forward; "the motorboat's wake capsized the canoe". wn