quiet vt.使平静；使安心。vi. 平静下来。
quiet down (v.+adv.) (使)安静，(使)平静，quiet sb/oneself/sth down。

【例句】
I am well aware that nothing else will quiet Tom.
我很清楚，别的任何办法都不能使汤姆罢休。

When he quieted down, I began to tell him the truth.
当他平静下来时，我开始告诉他实情。