How is “buck up” used?

In Sons of the Desert (1933), one line is: “Now, buck up. Go in and tell her that you're going to the convention.”

Which movie is “buck up” from?

The clip at the top of this page is from Sons of the Desert (1933).

to become more cheerful

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to become more cheerful
Well, Edward, you'll just need to buck up.
Come on. Buck up.

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

Now, buck up. Go in and tell her that you're going to the convention.

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