Idiom
promise the moon (to someone) and promise someone the moon
Theme: PROMISES
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 only paid the minimum wage.
Idiom
promise someone the moonpromise (someone) the moon
British, American & Australian, British & Australian to promise something impossible.He had promised her the earth but five years later they were still living in the same small house.