Definition of all cats are grey in the dark in English:

all cats are grey in the dark

(US at night all cats are gray)

phrase

proverb
  • The qualities that distinguish people from one another are obscured in some circumstances, and if they can't be perceived they don't matter.

    • ‘Franklin says that just as all cats are grey in the dark, all women would be the same for pleasure.’
    • ‘I have no memory of the RAF teleprinter Room but I can only suppose that, on the principle that all cats are grey in the dark, I was so used to seeing teleprinters in action that I didn't find it surprising unless the uniforms were a different colour.’
    • ‘Besides, don't they say that all cats are grey in the dark?’
    • ‘The old adage that at night all cats are gray is in fact quite true.’
    • ‘The sole bit of worldly advice my mother ever gave me was that all cats are grey in the dark.’