What does “by word of mouth” mean?

because people tell each other and not because they read about it

How is “by word of mouth” used?

In Twelfth Night (2012), one line is: “Or I'll deliver thy indignation to him by word of mouth.”

The clip at the top of this page is from Twelfth Night (2012).

Or I'll deliver thy indignation to him by word of mouth.

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