What does “knock on wood” mean?

used when you have just mentioned some way in which you have been lucky in the past, to avoid bringing bad luck

How is “knock on wood” used?

In Encanto (2021), one line is: “Knock, knock, knock, knock, knock. Knock on wood.”

The clip at the top of this page is from Encanto (2021).

Knock, knock, knock, knock, knock. Knock on wood.

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