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Definition (as) mad as a hatter/March hare in American English

(as) mad as a hatter/March hare phrase

phrase

Although neither phrase was coined by Lewis Carroll, they became more popular as a result of his children’s story Alice’s Adventures in Wonderland. Two of the characters Alice meets are a hatter and a March hare, both of whom behave very strangely.

1

extremely silly or strange, sometimes because of mental illness

Synonyms and related words
Definition (as) mad as a hatter/March hare in American English