View synonyms for blind as a bat

blind as a bat

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Idioms and Phrases

Quite blind; also, unaware. For example, Without my glasses I'm blind as a bat , or I had no idea they wanted me to take over his job; I was blind as a bat . This simile, based on the erroneous idea that the bat's erratic flight means it cannot see properly, has survived even though it is now known that bats have a sophisticated built-in sonar system. [Late 1500s]


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[in-vet-er-it ]

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Definitions and idiom definitions from Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.




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