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be as mad as a hatter

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be as mad as a hatter

to be crazy

Usage notes: A long time ago, people who made hats used a substance that gave them an illness which made people think they were crazy.

Her brother's as mad as a hatter.

See also: hatter, mad

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? References in classic literature
"He must be as mad as a hatter," exclaimed the Colonel. Moon and Sixpence by Maugham, W. Somerset View in context More results

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be as good as word
be as happy as Larry sandboy
be as hard as nails
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