The idiom "mad as a hatter" dates back to the 19th century and is associated with the hat-making industry. This phrase is used to describe someone who is acting extremely eccentric, irrational, or mentally unstable.

What is the origin of the idiom "mad as a hatter" and when to use it?

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(as|) mad as a (hatter|March hare)

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英語での「(as) mad as a hatter」の定義と意味

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