How is “by god” used?

In The Bounty (1984), one line is: “Or by God, you'll answer for it, sir!”

Which movie is “by god” from?

The clip at the top of this page is from The Bounty (1984).

Or by God, you'll answer for it, sir!

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A mild oath used to stress that a claim is true, or to show determination, defiance, anger, or surprise.

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A mild oath used to stress that a claim is true, or to show determination, defiance, anger, or surprise.