1. settle up的解释

1. He settled up with the waiter.
    他跟侍者结了帐。

1. 付清, 了结：873. settle down定居,专心于 | 874. settle up付清,了结 | 875. shake hands握手

2. 付清,结账：24. settle down定下心来,安家落户 | 25. settle up付清,结账 | 26. settle for勉强同意,接受

3. 结清：settle on 决定 | settle up 结清 | settle with 清算

4. 付清(欠帐)：satiety n. (市场的)充分供应;饱和 | settle up付清(欠帐) | shoestring n.小额资本;零星资本 a.小本经营的;小规模的

1. 付清(债务);结清(账单)
    When you settle up, you pay a bill or a debt.

    e.g. When we approached the till to settle up, he reduced our bill by 50 per cent.
           我们去收银台付款时，他给我们的账单打了对折。