english
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Phrase(s): *crazy as a betsy bug [and] *crazy as a peachorchard boar; *crazy as a loon Rur. acting as if insane. (*Also: as ~.) • Tom: Susan says she’s really the Queen of England. Bill: She’s crazy as a betsy bug. • Jill: David’s a little eccentric, isn’t he? Jane: Crazy as a loon, I’d say. • What’s wrong with Jim? He’s acting as crazy as a peach-orchard boar.
McGrawhill's American Idioms And Phrasal Verbs