Meaning of “leave no stone unturned” in the English Dictionary

british dictionary

"leave no stone unturned" in British English

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leave no stone unturned

C2 to do everything you can to achieve a good result, especially when looking for something:

He left no stone unturned in his search for his natural mother.

(Definition of “leave no stone unturned” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)