(as) blind as a bat

idiom

Definition of (as) blind as a bat

informal
: unable to see well at all : having very poor vision Without glasses I'm blind as a bat.

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“(as) blind as a bat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/%28as%29%20blind%20as%20a%20bat. Accessed 16 Jan. 2021.

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