(as) blind as a bat

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Related to as blind as a bat: off the bat, as deaf as a post

(as) blind as a bat

1. slang Unable to see at all. After neglecting his vision for years, my grandfather became blind as a bat, unable to even see shadows.
2. slang Having poor vision. I've worn glasses for 20 years, so I'm as blind as a bat now.
3. slang Oblivious to something. Are you blind as a bat? Those two have been flirting all afternoon!
See also: bat, blind