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backwash (n.)

1861, "motion of a receding wave;" see back (adv.) + wash (v.). As "residue in a glass or bottle of beer after drinking most of it," by 1897.

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Definitions of backwash from WordNet

backwash (n.)
the consequences of an event (especially a catastrophic event);
Synonyms: aftermath / wake
backwash (n.)
the wave that spreads behind a boat as it moves forward;
Synonyms: wake
backwash (n.)
the flow of air that is driven backwards by an aircraft propeller;
Synonyms: slipstream / airstream / race / wash
From wordnet.princeton.edu