I promise (或 I promise you)

(informal)used for emphasis, especially so as to reassure, encourage, or threaten someone

(非正式)（尤指用以加强安慰、鼓励或威胁的口气）我（向你）保证

oh, I'm not joking, I promise you.

哦，我不是在开玩笑，我向你保证。

on a promise

(informal)(of a person) confidently assured of something,especially of having sexual intercourse with someone

(非正式)（人）被确切保证某事的（尤指性关系）

a shop where Tom and I are on a promise with the girls serving there.

一家我和汤姆与女服务员有默契的商店。

promise (someone) the earth (或moon)

make extravagant promises to someone that are unlikely to be fulfilled

夸下海口

interactive technology titillates, promises the earth but delivers nothing.

交互式技术令人兴奋，吹得响，实效少。

promises, promises

(informal)used to indicate that the speaker is sceptical about someone's stated intention to do something

(非正式)（表示说话者怀疑某人宣称的意图）诺言复诺言