How is “to boot” used?

In Harry Potter and the Chamber of Secrets (2002), one line is: “And it's codswallop to boot. Dirty blood.”

Which movie is “to boot” from?

The clip at the top of this page is from Harry Potter and the Chamber of Secrets (2002).

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He was a vegetarian, and a fussy one to boot.

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

And it's codswallop to boot. Dirty blood.

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