Meaning of “foolproof” in the English Dictionary

british dictionary

"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)