promise someone the moon

US /ˈprɑmɪs ˈsʌmˌwʌn ðə mun/
UK /ˈprɑmɪs ˈsʌmˌwʌn ðə mun/
"promise someone the moon" picture
1.

to make extravagant or impossible promises to someone

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He's always trying to promise someone the moon to get what he wants, but he never delivers.
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Don't believe him, he's just trying to promise you the moon to get your vote.
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