Meaning of “open-and-shut” in the English Dictionary

british dictionary

"open-and-shut" in American English

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open-and-shutadjective

us /ˈoʊ·pə·nər/

easy to prove or answer:

Our lawyer thinks that we have an open-and-shut case.

(Definition of “open-and-shut” from the Cambridge Academic Content Dictionary © Cambridge University Press)