give (somebody) one's word 约定

give sb one's word 表明“约定”的意思，主要用作 I give you my word (我向你保证）的形态。换句话说，可以理解成 I'll promise you,对于被承诺的一方，则是 take one's word。

例句：

I will give you my word I'll do what I can.

我向你保证，我会尽我所能的。

I will give you my word I will not touch her.

我向你保证，绝对不会碰她。

Can you give me your word that Jack can be trusted?

你能向我保证，杰克是个值得相信的人吗？

对话：

A: Do you think Ralph finished the report?

你觉得拉斐尔写完报告书了？

B: He gave me his word it would be completed.

他向我保证会完成的。