up是副词。
mop up 做扫尾工作；擦，抹；痛击；吃完
如：
1. Please mop up the mess .
请擦掉这堆脏东西。
2. Two companies were left to mop up.
留下两个连进行扫荡。
3. We must mop up the arrears of work .
我们必须把耽误的工作做完。
4. You should have seen him mop up his dinner.
他该看看他那狼吞虎咽的样子才好。
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