Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb intransitive, idiomatic To complain or otherwise express oneself in a loud, immoderate manner.
  • verb intransitive, idiomatic To talk impudently, especially to one's superior.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb talk in a noisy, excited, or declamatory manner

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From mouth + off.

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