What does “watch your mouth” mean?

to be careful what you say in order not to offend sb or make them angry

How is “watch your mouth” used?

In The Return of the Living Dead (1985), one line is: “- Watch your tongue if you like this job! - Like this job?”

The clip at the top of this page is from The Return of the Living Dead (1985).

- Watch your tongue if you like this job! - Like this job?

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