The hostess waits on tables/people when the restaurant is crowded.餐馆人多时，老板娘便会亲自招待顾客。

He is busy waiting on customers at the moment.他此刻正忙着接待顾客。

He seems to expect his wife to wait on him.他似乎希望妻子来伺候自己。

She waited on her children hand and foot. [=she acted like a servant to her children; she provided her children with everything they needed or wanted]她无微不至地伺候着自己的孩子们。

We waited on him, but he never came.我们在等他，但他却一直没来。

The government's decision must wait on the committee's report. [=the government's decision will not be made until the committee has issued its report]政府必须要等委员会发布报告后才能做出决定。