How is “sign away” used?

In Atlas Shrugged: Part I (2011), one line is: “I'll sign away my other companies, but they are not getting my metal.”

Which movie is “sign away” from?

The clip at the top of this page is from Atlas Shrugged: Part I (2011).

Phrasal verb

to lose your rights or property by signing a document

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

I'll sign away my other companies, but they are not getting my metal.

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