How is “turn the corner” used?

In The King and I (2018), one line is: “I will stay here until she turns the corner.”

Which movie is “turn the corner” from?

The clip at the top of this page is from The King and I (2018).

I will stay here until she turns the corner.

4 作品で登場 · 1 本目

to pass a very important point in an illness or a difficult situation and begin to improve

3 本の映画に登場

オックスフォード映画の 100%
to pass a very important point in an illness or a difficult situation and begin to improve
Are you ready to turn the corner?

定義：Oxford Advanced Learner's Dictionary 第 9 版