- 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.
verb (used with object)
- 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.
- a sucking movement of water, such as that of retreating wavesCompare swash (def. 4)
- water washed backwards by the motion of oars or other propelling devices
- the backward flow of air set up by an aircraft’s engines
- a condition resulting from a previous event; repercussion
- (tr) to remove oil from (combed wool)