Definition of promise someone the earth or moon in English:

promise (someone) the earth (or moon)

Make extravagant promises to someone that are unlikely to be fulfilled: interactive technology titillates, promises the earth but delivers nothing
More example sentences
  • With only a few days remaining there will be higher temptations by many people to lie by promising them the moon.
  • While some parties are talking about Muslim rights, others are promising them the moon.
  • At the same time he was promising me the moon, he was making plans to see her!
See parent entry: promise

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
rich in, covered with, or producing oil; oily