BATS, BLIND AS SIX

quite blind. This expression comes from the fact that bats normally sleep during daylight hours and emerge at night to forage for food. If they are frightened out of their nests when it is bright outside, they have trouble seeing. —PDC Volume 4 Approved Glossary

quite blind. This expression comes from the fact that bats normally sleep during daylight hours and emerge at night to forage for food. If they are frightened out of their nests when it is bright outside, they have trouble seeing.a coined variation and intensification of the phrase blind as a bat.