Brainwash meaning

brān'wŏsh', -wôsh'
To affect one's mind by using extreme mental pressure or any other mind-affecting process. (i.e. hypnosis)
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To indoctrinate so intensively and thoroughly as to effect a radical transformation of beliefs and mental attitudes.
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To brainwash is to change someone's beliefs or attitudes using intense teaching and indoctrination.

An example of brainwash is to lock new religious converts in a room and teach them the details of a religion without allowing access to the outside world.

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To subject to brainwashing.
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The process or an instance of brainwashing.
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To subject to brainwashing.
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The process or an instance of brainwashing.
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An effect upon one's memory, belief, or ideas.
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(figuratively, dated) To take from an electronically controlled machine its stored-up information; to erase a computer's programming. (1960)
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Origin of brainwash

A calque of the Chinese 洗脑 (xǐ nǎo), literally "to wash the brain". Usage via U.S. military during Korean War.