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be as mad as a March hare

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be as mad as a March hare

To be crazy. The phrase alludes to hares' erratic behavior during their breeding season. Mom was as mad as a March hare after I dented her brand-new car.

See also: hare, mad, march

be as mad as a March hare

  (old-fashioned)

to be crazy This woman was dancing in the road and singing very loudly - I thought she was mad as a March hare.

See also: hare, mad, march