What does 'Tough nut to crack' mean?

If something is a tough nut to crack, it is difficult to find the answer or solution. When used about a person, it means that it is difficult to get them to do or allow what you want. 'Hard nut to crack' is an alternative.

Idioms similar to 'Tough nut to crack'


All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.

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