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Region: US | Usage example: He must have bats in the belfry if he thinks that idea will work.

Bats in the belfry

Meaning

Acting irrationally or being slightly crazy.

Usage

Used playfully to suggest someone is eccentric or confused.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Imagery of bats nesting in church bell towers creating chaos.

Popularized in early 20th-century American slang.

Related Idioms

A penny saved is a penny earned

Being frugal today can grow future wealth.

A few cards short of a deck

Slightly lacking intelligence or common sense.

Barking up the wrong tree

Accusing or pursuing the wrong person/idea; making a false assumption.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.