a door must be either shut or open

a door must be either shut or open

proverb One must choose between two options that cannot both be true or both happen at the same time. (Just as a door cannot simultaneously be open and closed.) You're never going to feel rested if you keep staying up so late. A door must be either shut or open—you can't have it both ways. Well, do you love him or not? A door must be either shut or open.
See also: door, either, must, open, shut
Farlex Dictionary of Idioms.
See also:
  • teach a man to fish
  • it takes a village
  • village
  • change horses in midstream, don't
  • all cats are gray after dark/at night
  • a cat in gloves catches no mice
  • cat in gloves catches no mice
  • best-laid plans go astray, the
  • the best-laid plans
  • the best-laid plans of mice and men