Apedia

Mouth Talk Run Ms Rosario Running Kids Playing

Idiom Run off at the Mouth
Example Ms. Rosario was running off at the mouth again about the kids playing basketball in her backyard.
Meaning to talk too much; to talk nonstop
Origin This is a colorful, modern African-American expression. It calls to mind one definition of the verb "to run" that relates to water: to flow quickly. Imagine a flood of words gushing rapidly out of someone's mouth and you get the idea.

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