bats in the/one's belfry

idiom

Definition of bats in the/one's belfry

informal + old-fashioned
to have bats in the belfry or (chiefly US) bats in one's belfry is to be crazyan old woman with bats in her belfry

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“Bats in the/one's belfry.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/bats%20in%20the/one's%20belfry. Accessed 28 January 2020.

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