How is “read up” used?

In Godzilla vs. Kong (2021), one line is: “Read up on it, sheep. Mind control.”

Which movie is “read up” from?

The clip at the top of this page is from Godzilla vs. Kong (2021).

Read up on it, sheep. Mind control.

5 作品で登場 · 1 本目

句動詞

to read a lot about a subject

5 本の映画に登場

read sth up
to read a lot about a subject
I'll need to read up on the case before the meeting.

定義：Oxford Advanced Learner's Dictionary 第 9 版