A hard nut to crack Meaning (1) a problem or situation tha | English Choice

A hard nut to crack

Meaning

(1) a problem or situation that's difficult to solve or deal with;

(2) a person who is difficult to understand or know;

(3) a group, place or opportunity that's difficult to join or gain entry.

For example

 This algebra equation sure is a hard nut to crack.

Congratulations on restoring your antique car—I'll bet that was a hard nut to crack. 

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