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English definition of “a hard/tough nut to crack”

a hard/tough nut to crack

a problem that is very difficult to solve or a person who is very difficult to understand Difficult things and peoplePreventing and impeding
(Definition of a hard/tough nut to crack from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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Translations of “a hard/tough nut to crack”

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