clean up: 1.掃除,清掃eg：to give the house a good clean up 給房子來一次徹底的掃除.
2.【美俚】賺的一大筆錢
clear up：1.說明,解釋,解答 eg：to clear up a mystery 解開謎團(tuán)
2.整理,收拾,完成 eg：Don't expect me to clear up after you(tidy your things)all the time.不要老是指望我替你收拾東西.
3.好轉(zhuǎn),結(jié)束 eg:I hope the weather clears up before Sunday.我希望星期日前天氣會轉(zhuǎn)晴.