Big Brother Meaning in the Cambridge English Dictionary
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Meaning of “Big Brother” in the English Dictionary

"Big Brother" in British English

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Big Brothernoun [S]

uk   us  
a way of referring to a ​government, ​ruler, or ​person in ​authority that has ​completepower and ​tries to ​control people's ​behaviour and ​thoughts and ​limittheirfreedom
(Definition of Big Brother from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"Big Brother" in American English

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Big Brothernoun [C usually sing]

 us   /ˈbɪɡ ˈbrʌð·ər/
a ​government or ​person in ​authority that ​tries to ​control people’s ​behavior and ​thoughts
(Definition of Big Brother from the Cambridge Academic Content Dictionary © Cambridge University Press)
Translations of “Big Brother”
in Chinese (Simplified) “老大哥”, 专制政府, 独裁者…
in Chinese (Traditional) 專制政府, 獨裁者…
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