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.

What is the origin of the idiom "hard nut" and when to use it?

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“ hard nut (to crack)”的英语定义和含义

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