Definition of "brainwash"

A distorting effect upon one's memory, belief, or ideas, as by propaganda.  examples

(psychology) To affect one's mind by using extreme mental pressure or any other mind-affecting process. (e.g. hypnosis)

(figuratively, dated) To take from an electronically controlled machine its stored-up information; to erase a computer's programming. (1960)  examples

To persuade completely and forcibly.  examples