A. An easy question
B. A foolish search
C. A difficult problem
D. Expensive thing
Submitted by: Areesha Khan
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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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The correct answer to the question: "The idiom a hard nut to crack means:" is "A difficult problem".