American English

Definition of speak up phrasal verb from the Oxford Advanced American Dictionary

 

speak up

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

speak up (for somebody/something)

 
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to say what you think clearly and freely, especially in order to support or defend someone or something
See the Oxford Advanced Learner's Dictionary entry: speak up