Expression: "hard nut to crack"
Meaning: Some nuts, such as peanuts, crack open relatively easily. Cracking open some other nuts, however, can require more physical effort. So while some problems can be easy to solve, like the ease with which you can crack open peanuts, this idiom developed as a way to refer to other problems, like hard-to-crack nuts, that are more difficult to solve.
Example: "This crossword puzzle is a hard nut to crack."
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