Definition of “brainwash” - English Dictionary

“brainwash” in British English

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brainwashverb [ T ]

uk /ˈbreɪn.wɒʃ/ us /ˈbreɪn.wɑːʃ/ disapproving

to make someone believe something by repeatedly telling them that it is true and preventing any other information from reaching them :

Their government is trying to brainwash them into thinking that war cannot be avoided.
brainwashing
noun [ U ] uk /ˈbreɪn.wɒʃ.ɪŋ/ us /ˈbreɪn.wɑː.ʃɪŋ/

Many people thought the sect was guilty of brainwashing.

(Definition of “brainwash” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“brainwash” in American English

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brainwashverb [ T ]

us /ˈbreɪnˌwɑʃ, -ˌwɔʃ/

to make people believe only what you want them to believe by continually telling them that it is true and preventing any other information from reaching them:

Could it be that we’re brainwashed to accept these things?

(Definition of “brainwash” from the Cambridge Academic Content Dictionary © Cambridge University Press)