How is “bite your tongue” used?

In Anne of Green Gables (1985), one line is: “all of them very good reasons for you to have bit your tongue.”

Which movie is “bite your tongue” from?

The clip at the top of this page is from Anne of Green Gables (1985).

all of them very good reasons for you to have bit your tongue.

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to stop yourself from saying sth that might upset sb or cause an argument, although you want to speak

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to stop yourself from saying sth that might upset sb or cause an argument, although you want to speak
That's what I used to imagine diamonds were like, and then I saw a real diamond in a ladies- Oh, for goodness sake, child! Bite your tongue, and come along.

定義：Oxford Advanced Learner's Dictionary 第 9 版