promise (one) the moon

promise (one) the moon

To promise one something that cannot be done. Your clients will come to distrust you if you keep promising them the moon.
See also: moon, promise
Farlex Dictionary of Idioms.

promise the moon (to someone)

 and promise someone the moon
to make extravagant promises to someone. Bill will promise you the moon, but he won't live up to his promises. My boss promised the moon, but never gave me a raise.
See also: moon, promise
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

promise the moon

If someone promises the moon, they promise to do or give things that they cannot in fact give. Politicians promise the moon at election time, but do they deliver once they're elected?
See also: moon, promise
Collins COBUILD Idioms Dictionary, 3rd ed.

promise someone the moon (or earth)

promise something that is unattainable. British
1998 New Scientist Scientists tend to promise taxpayers the moon, and then not deliver.
See also: moon, promise, someone
Farlex Partner Idioms Dictionary

promise (somebody) the ˈmoon/ˈearth/ˈworld

(informal) make very big or impossible promises that you are unlikely to keep: He promised her the moon, but after ten years of marriage they hardly had enough to live on.
See also: earth, moon, promise, world
Farlex Partner Idioms Dictionary
See also:
  • promise someone the moon
  • promise the moon
  • promise the moon/earth/world
  • breach of promise
  • keep (one's) promise
  • a promise is a promise
  • keep a promise
  • be over the moon
  • over the moon
  • man in the moon, (no more than) the