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hard nut (to crack)
01
someone or something that is difficult to understand, deal with, or overcome
Idiom
Informal
What is the origin of the idiom "hard nut" and when to use it?
The idiom "hard nut" is used to describe a person who is difficult to deal with or a problem that is challenging to solve. It originated in the late 19th century and draws its metaphorical meaning from the idea of cracking open a nut. Just as some nuts have tough shells that are hard to break, this expression refers to someone who is resistant, unyielding, or stubborn.
Examples
The new manager is polite, but he is a hard nut to crack.
