Definition of backwashed:
(n) :
The result or consequence of an event; an aftermath.
(n) :
(nautical) A backward flow of water, as from oars, a propeller, breaking waves, etc.
(n) :
The similar flow of air from an aircraft engine.
(n) :
The saliva, spit or food particles that have flowed back into a drink after someone has drunk from it.
(n) :
(economics) The situation where economic growth in one area harms other areas by attracting people and business away from those areas.
(v) :
To operate a water filter in the reverse direction in order to clean it.