promise the moon

promise the moon

1. (informal, figuratively) to make promises that are impossible to fulfill

   Synonyms: promise the earth, promise the stars, promise the world

• ask for the moon

• “promise somebody the moon the earth” in Longman Dictionary of Contemporary English, Longman.
• “promise someone the moon earth” (US) / “promise someone the moon earth” (UK) in Macmillan English Dictionary.
• “promise sb the earth moon” in the Cambridge English Dictionary, Cambridge: Cambridge University Press.
• “promise the moon” in Lexico, Dictionary.com; Oxford University Press.