Definition: backwash

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Source: WordNet (r) 1.7 

backwash
     n 1: the flow of air that is driven backwards by an aircraft
          propeller [syn: slipstream, airstream, race, wash]
     2: 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" [syn: aftermath,
         wake]
     3: the wave that spreads behind a boat as it moves forward;
        "the motorboat's wake capsized the canoe" [syn: wake]

Source: Webster's Revised Unabridged Dictionary (1913) 

Backwash \Back"wash`\, v. i.
   To clean the oil from (wood) after combing.