How is “finish off” used?

In The Boy in the Striped Pajamas (2008), one line is: “Because I think you should go back upstairs and finish off.”

Which movie is “finish off” from?

The clip at the top of this page is from The Boy in the Striped Pajamas (2008).

Because I think you should go back upstairs and finish off.

8 作品で登場 · 1 本目

句動詞

to destroy sb / sth, especially sb / sth that is badly injured or damaged; to do the last part of sth; to make sth end by doing one last thing

9 本の映画に登場

1
finish sb / sth offくだけた
to destroy sb / sth, especially sb / sth that is badly injured or damaged
The hunter moved in to finish the animal off.
2
finish sth off
to do the last part of sth; to make sth end by doing one last thing
I need about an hour to finish off this report.

定義：Oxford Advanced Learner's Dictionary 第 9 版