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Phrase(s): spout off (about someone or something)
1. to brag or boast about someone or something. • Stop spouting off about Tom. Nobody could be that good! • Alice is spouting off about her new car. 2. to speak out publicly about someone or something; to reveal information publicly about someone or something. • I wish you wouldn’t spout off about my family affairs in public. • There is no point in spouting off about this problem.
McGrawhill's American Idioms And Phrasal Verbs