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open-and-shut

adjective
 
 
/ˌəʊ.pən.ənˈʃʌt/ US  /ˌoʊ-/

Definition

describes a problem or legal matter that is easy to prove or answer: Our lawyer thinks that we have an open-and-shut case.Easiness and simplicity
(Definition of open-and-shut adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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