Nautical . water thrown backward by the motion of oars, propellers, paddle wheels, etc.

Aeronautics . the portion of the wash of an aircraft that flows to the rear, usually created by the power plant. Compare wash ( def. 31 ) .

a condition, usually undesirable, that continues long after the event which caused it.

to affect, as by hitting, rocking, or splashing, with a backwash

a powerful cutter backwashing the skiers.

to clean out (a clogged filter) by reversing the flow of fluid

Backwash the swimming pool's filters regularly.

noun

aftermath , result , wake