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open and shut
Clear-cut or straightforward, as of a legal case. Often hyphenated if used before a noun. With all the evidence against the defendant, I expect this to be an open-and-shut case. Her signature on the documents proves she accepted the payment, so it seems pretty open and shut who is responsible.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
open-and-shut(of a case or argument) admitting no doubt or dispute; straightforward and conclusive.
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