all cats are gray by night(redirected from all cats are grey by night)
all cats are gray by night
proverb In the dark of night, appearances do not matter (because it is too difficult to see anything clearly). A: "I can't believe you're going on a date with someone you've never met before! What if you don't think he's attractive?" B: "Eh, all cats are gray by night—it will be fine."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.