a hard/tough nut to crack Definition in the Cambridge English Dictionary
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Definition of “a hard/tough nut to crack” - English Dictionary

Definition of "a hard/tough nut to crack" - British English Dictionary

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a hard/tough nut to crack

a ​problem that is very ​difficult to ​solve or a ​person who is very ​difficult to ​understand
(Definition of a hard/tough nut to crack from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
Translations of “a hard/tough nut to crack”
in Chinese (Simplified) 棘手的问题, 难以理喻的怪人…
in Chinese (Traditional) 棘手的問題, 難以理喻的怪人…
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