American Heritage Dictionary
(4)
Century Dictionary
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
This is another example of dem leadership capitulating to the backwash - thoroughly discredited and unpopular politicians and agendas.— Think Progress
The supervisor of the water supply in the municipal office, Tenzin, said that they carry out backwash, a process used to remove mud and other sediments by channeling water from a greater height, from the bottom of the sedimentation tanks, every two or three days.— Kuensel Newspaper

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