Usually means: Speak rudely or disrespectfully aloud.
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We found 16 dictionaries that define the word mouth off:

General (13 matching dictionaries)
  1. mouth off: Merriam-Webster.com
  2. mouth off: Oxford Learner's Dictionaries
  3. mouth off: Collins English Dictionary
  4. mouth off: Vocabulary.com
  5. mouth off (about sth), mouth off (to/at sb): Cambridge Advanced Learner's Dictionary
  6. mouth off: Wiktionary
  7. mouth off: Dictionary.com
  8. mouth off: Rhymezone
  9. mouth off: Free Dictionary
  10. mouth off: Mnemonic Dictionary
  11. mouth off: Dictionary/thesaurus

Computing (1 matching dictionary)
  1. mouth off: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. mouth off: Idioms

Slang (1 matching dictionary)
  1. mouth off: English slang and colloquialisms used in the United Kingdom

Definitions from Wiktionary (mouth off)

verb:  (intransitive, slang) To complain or otherwise express oneself in a loud, immoderate manner.
verb:  (transitive, intransitive, slang) To talk impudently, especially to one's superior.

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