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Synonyms

bats

American  
[bats] / bæts /

adjective

Slang.
  1. insane; crazy.

    He's gone bats.


bats British  
/ bæts /

adjective

  1. informal crazy; very eccentric

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of bats

First recorded in 1915–20; see origin at bat 2, -s 3

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Bats are protected by law in the U.K.—some species are at risk of extinction—and so developers have to assess the environmental impacts of a new road on bats and take measures to mitigate them.

From Slate • Apr. 28, 2026

"This is a new type of approach to air power where you have a crewed fighter giving directions to four or five Ghost Bats flying in formation with it," he said.

From Barron's • Mar. 27, 2026

Bats are recognized as natural hosts for many zoonotic viruses, including rabies, Nipah, Hendra, Marburg, and SARS-CoV-1.

From Science Daily • Feb. 1, 2026

I’ve written extensively about my love for sour candies, so naturally, I couldn’t pass up the opportunity to try TJ’s Spooky Bats & Cats Sour Gummy Candies.

From Salon • Sep. 29, 2025

Bats flew like dust in a granary, then returned to their places, a few at a time, until all was still again, motionless, as if lifeless.

From "Grendel" by John Gardner

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