to serve food and drink, especially to customers in a restaurant

The staff who waited on us at dinner were excellent. 吃饭时为我们服务的侍者非常不错。

She waited on tables (= served meals as a job) to earn some extra money. 她当侍者来挣些额外的收入。

to do everything for someone so that that person does not have to do anything for himself or herself

While she was pregnant, her husband waited on her hand and foot (= did everything for her). 她怀孕时，她丈夫无微不至地照顾她。

to wait until you know the result of an activity before doing or deciding something

The lawyers are waiting on the jury's verdict. 律师们在等待陪审团的裁决。