promise (one) the earth(redirected from promise him the earth)
promise (one) the earth
To promise one something that is not feasible or cannot be done. Your clients will come to distrust you if you keep promising them the earth and then inevitably fail to deliver.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
promise the earth
If someone promises the earth, they promise to give people things that they cannot in fact possibly give them. `Politicians have lost credibility,' he complained, `they promise the earth and don't deliver.'
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012