have bats in the belfry
US /hæv bæts ɪn ðə ˈbɛl.fri/
UK /hæv bæts ɪn ðə ˈbɛl.fri/
1.
to be eccentric or crazy
:
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My old neighbor seems to have bats in the belfry; she talks to her garden gnomes.
•
I think he might have bats in the belfry, considering his strange theories about aliens.