promise someone 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. © 2024 Farlex, Inc, all rights reserved.

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 © Farlex 2017