have bats in one's belfry

== English == === Alternative forms === have bats in the belfry === Etymology === 1899, from tendency of bats to fly around erratically, with “belfry” indicating “head, mind”. === Verb === have bats in one's belfry (third-person singular simple present has bats in one's belfry, present participle having bats in one's belfry, simple past and past participle had bats in one's belfry) (idiomatic, intransitive) To be crazy or eccentric. ==== Synonyms ==== See also Thesaurus:insane ==== Derived terms ==== batshit batty ==== Translations ==== === References ===