backwashPronunciation: /ˈbakwɒʃ/Definition of backwash noun [mass noun] the motion of receding waves: the backwash is reduced in energy by the percolation of water into the shingle a backward current created by an object moving through water or air: the backwash of a truck on the autobahn the unpleasant after-effects of an event:the backwash of the Cuban missile crisis verb [with object] clean (a filter) by reversing the flow of fluid through it: the very fine mesh is backwashed to remove solidsbackwash in other Oxford dictionaries Definition of backwash in the US English dictionary
