mad as a March hare


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(as) mad as a March ˈhare

(informal) (of a person) crazyA March hare refers to a hare (= an animal like a large rabbit) that behaves very strangely in the breeding season.
See also: hare, mad, march

mad as a March hare

Crazy. According to folklore, hares behave as though they're “sparring” with other hares and leaping around for no discernible reason during their breeding season. Their breeding season in Europe begins during the month of March.
See also: hare, mad, march