1. 打扫;清洗;肃清;整顿
    A clean-up is the removing of dirt, pollution, crime, or corruption from somewhere.

    e.g. ...the need for a clean-up of Italian institutions...
           对意大利各机构进行整顿的必要性
    e.g. The Governor has now called in the National Guard to assist the cleanup operation.
           总督已经调动了国民卫队协助清剿行动。