打保票

打保票:

Literally means:

vouch for; guarantee

Actually means:

It means being absolutely certain about one's own prediction.

It means promising to fulfill a task.

It means vouching for somebody or something.

表示自己对于某件事情的预料有绝对的把，保证自己一定能够完成某事。

为某人或某事物作出保证。