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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From bat + -y. In sense “insane”, attested 1903, from expression have bats in one's belfry, from tendency of bats to fly around erratically. Compare also batshit (“insane”) and squirrelly (“jumpy, eccentric”).
balmy, barmy, bats, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky
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Classic usage
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