Learn what "he's a tough nut to crack" means, when people say it, and how to use it naturally in English.

It means the person is difficult to understand, persuade, or deal with.
From The Unforgettable Love, Episode 36
Someone describes another person as hard to understand or deal with.
Use this for someone who is stubborn, private, or hard to read. It is common in spoken English but less useful as a direct action phrase.
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