The idiom a hard nut to crack means:

A. An easy question
B. A foolish search
C. A difficult problemCorrect Answer
D. Expensive thing
Correct Option: C. A difficult problem
Detailed Explanation & Reference:

A difficult problem; also, an individual who is difficult to deal with. For example, This assignment is a hard nut to crack , or It won’t be easy getting her approval; she’s a tough nut to crack . This metaphoric expression alludes to hard-shelled nuts like walnuts.

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