wait on someone/something
phrasal verb with wait verb [ I ] uk/weɪt/ us/weɪt/
mainly US
（尤指在餐馆里）服侍…进餐，给…上菜
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。