How is “join forces” used?

In Transformers: Age of Extinction (2014), one line is: “We must join forces, or else forever be their slaves.”

Which movie is “join forces” from?

The clip at the top of this page is from Transformers: Age of Extinction (2014).

We must join forces, or else forever be their slaves.

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to work together in order to achieve a shared aim

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to work together in order to achieve a shared aim
We must join forces, or else forever be their slaves.

定義：Oxford Advanced Learner's Dictionary 第 9 版