Definition of speak up phrasal verb from the Oxford Advanced Learner's Dictionary

  

speak up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
 usually used in orders to tell somebody to speak more loudly Please speak up—we can't hear you at the back.

speak up

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speak up for somebody

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speak up for something

 
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 to say what you think clearly and freely, especially in order to support or defend somebody/something
See the Oxford Advanced American Dictionary entry: speak up