adjective[predicative] informal, dated
(Of a person) mad.
- I know she's good at getting press (partially because she's really good at marketing her fair-weather femininity), but it's obvious that she's bats.
- We realize in short order that she's bats, and that simple observation steals a great deal of power from the proceedings.
- I have in fact stated a number or times that I think he's bats.
Early 20th century: from the phrase have bats in the belfry (see bat2).
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