- Home
- Idioms
- all cats are grey by night
all cats are grey by night
all cats are grey by night
In the dark of night, appearances do not matter (because it is so difficult to see anything). 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: "Ah, all cats are grey by night, so it will be fine."