Polish off - Tradução em português

Polish sth off informal

to finish something quickly and easily, especially a lot of food or work:

He polished off the whole pie.

I polished off three essays in one week.

polish sb off mainly US informal

to kill someone:

He was accused of polishing off his former partner.

polish sth/sb off informal

Arsenal polished off Chelsea 5–0 in Saturday's match.

Alguém poderia me explicar o uso desse phrasal verb em inglês?

e também essa frase "I'm 20 stories up, yeah I'm up at the top,
I'll polish off this bottle, now it's pushing me off" é um trecho da musica "Bullet".

Thanks