jot

n. 少量
v. 匆匆记下
vi. 草草记下
vt. 匆匆写下

There's not a jot of truth in his story.

他讲的一句实话也没有。

I'll just jot down their phone number before I forget it.

我得把电话号码记下来，以免待会儿忘记。