unconscious to something
unable to recognize problems or bad things.
you can use this idiom to refer to someone who refuses to notice an obvious thing
someone is blind as a bat is unable to see at all (literal meaning)
having poor vision or bad eyesight (literal meaning)
Maria is so in love, she is as blind as a bat when it comes to Mark’s rude behavior.
Jenny’s husband is as blind as a bat even when he knows that she is having an extramarital affair.
I have such a lousy eyesight that at the time of diagnosis, I was called as a blind as a bat by the ophthalmologist.
Even was Lauren was so rude to his colleagues, his boss gave him promotion because he was as blind as a bat to see his behavior affecting other people.
Ross is as blind as a bat when it comes to Emma’s disgraceful behavior.
My grandfather was so ignorant on his vision that at the age of 70, he was as blind as a bat.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.