Last Updated
：2025/11/26
hard nut to crack
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Used other than figuratively or idiomatically: see hard, nut, crack. / (idiomatic) A problem that is challenging to solve.
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hard nut to crack
We found a hard nut to crack under the oak tree and used a stone to open it.
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We found a hard nut to crack under the oak tree and used a stone to open it.
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