Last Updated
：2025/11/20
tough nut to crack
（ plural ）
Quizzes for review
(idiomatic) A problem that is challenging to solve. / (idiomatic, by extension) A situation, person, group, etc. which is difficult to deal with.
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tough nut to crack
Fixing the legacy billing system proved to be a tough nut to crack for the development team.
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Fixing the legacy billing system proved to be a tough nut to crack for the development team.
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