to finish som ething quickly and easily, especially a lot of food or work

He polished off the whole pie. 他风卷残云般地吃掉了一整块馅饼。

I polished off three essays in one week. 我在一周内赶写了3篇文章。

to defeat a competitor easily

Arsenal polished off Chelsea 5–0 in Saturday's match. 阿森纳队在周六的比赛中以5：0干净利落地击败了切尔西队。

San Fransisco polished off the injury-riddled Los Angeles Lakers. 旧金山队轻松战胜了伤员累累的洛杉矶湖人队。

to kill someone

He was accused of polishing off his former partner. 他被控杀死了以前的合伙人。