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batty (adj.)
[batty 词源字典]
1580s, "pertaining to bats," from
bat
(n.2) +
-y
(2). Slang sense "nuts, crazy" is attested from 1903, from the expression (to have)
bats in (one's) belfry
, also meaning "not be right in the head" (1899).
[batty etymology, batty origin, 英语词源]