blind as a bat

idiomatic phrase

variants or less commonly as blind as a bat
informal + often offensive
: unable to see well : having very poor vision see usage paragraph at blind entry 1

Word History

First Known Use

1609, in the meaning defined above

Time Traveler
The first known use of blind as a bat was in 1609

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Cite this Entry

“Blind as a bat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blind%20as%20a%20bat. Accessed 10 Nov. 2025.

Last Updated: - Entry added
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