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English definition of “speak out/up”

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speak out/up

verb uk phrasal verb with speak   /spiːk/ (spoke, spoken) us  
to give your opinion about something in public, especially on a subject that you have strong feelings about: If no one has the courage to speak out against the system, things will never improve.
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(Definition of speak out/up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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