have bats in the belfry

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have bats in the belfry

To be crazy; to act, think, or behave in a foolish or nonsensical manner. Tommy must have bats in the belfry if he thinks he can convince our mother to let him get a tattoo for his birthday. There's an old lady who stands on the corner yelling at strangers all day. I think she might have bats in the belfry.
See also: bats, belfry, have

have bats in the belfry

  (old-fashioned)
to be crazy Don't tell anyone else I said that or they'll think I've got bats in the belfry.
See also: bats, belfry, have