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open-and-shut
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Quick answer
As an adjective, open-and-shut means so obvious as to be easily solved or decided.
Meanings of open-and-shut
1 meaningadjective
So obvious as to be easily solved or decided
“an open-and-shut case”
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).