As blind as a bat
/əz blaɪnd əz ə bæt/informalUK · US
What does “As blind as a bat” mean?
As blind as a bat means unable to see well
Someone searching for their glasses might say they are as blind as a bat without them. They usually mean things look blurred, not that they see nothing at all.
The phrase can also tease someone for failing to spot an obvious object. Keep it friendly; another person may not welcome the joke.
When do people say it?
Often a joking exaggeration about your own poor eyesight, especially without glasses. Avoid using it to mock someone else’s sight.
“Without my glasses, I'm as blind as a bat and can't read that sign.”
Is it formal or informal?
Register: informal. It is most at home in everyday conversation rather than formal writing. Most common in UK and US.
Where does it come from?
The saying compares poor sight with a bat. It is a familiar exaggeration, not a reliable description of the animal.
Origin confidence: Disputed; treat with caution
How do you say “As blind as a bat” in other languages?
Last updated 2026-10-01