foolproof Meaning in the Cambridge English Dictionary
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Meaning of “foolproof” in the English Dictionary

"foolproof" in British English

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foolproofadjective

uk   us   /ˈfuːl.pruːf/
(of a ​plan or ​machine) so ​simple and ​easy to ​understand that it is ​unable to go ​wrong or be used ​wrongly: I don't ​believe there's any such thing as a foolproof ​system for making ​money. This new ​DVDplayer is ​supposed to be foolproof.
(Definition of foolproof from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"foolproof" in American English

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foolproofadjective [not gradable]

 us   /ˈfulˌpruf/
(of a ​plan, ​method, or ​machine) ​designed to be ​easily done or ​operated without ​possibility of ​mistake or ​failure: It’s not a foolproof ​system and it never will be.
(Definition of foolproof from the Cambridge Academic Content Dictionary © Cambridge University Press)
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