bat2
• noun 1 a flying nocturnal mammal with membranous wings that extend between the fingers and limbs. 2 (old bat) informal an unattractive and unpleasant woman. — PHRASES have bats in the belfry informal be eccentric or mad. — ORIGIN Scandinavian; sense 2 is from bat, an old slang term for prostitute , or from BATTLEAXE.
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