How is “swear in” used?

In Nocturnal Animals (2016), one line is: “You'll swear in a court of law under penalty of perjury?”

Which movie is “swear in” from?

The clip at the top of this page is from Nocturnal Animals (2016).

You'll swear in a court of law under penalty of perjury?

6 作品で登場 · 1 本目

句動詞

to make sb promise to do a job correctly, to be loyal to an organization, a country, etc.

6 本の映画に登場

swear sb in
to make sb promise to do a job correctly, to be loyal to an organization, a country, etc.
He was sworn in as president.

定義：Oxford Advanced Learner's Dictionary 第 9 版