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

 

speak for

 phrasal verb
phrasal verb
 
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Phrasal Verbs

speak for somebody

 
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to state the views or wishes of a person or a group; to act as a representative for someone Our party speaks for the poor and unemployed. I can't speak for the others, but I'd love to come myself.
See the Oxford Advanced Learner's Dictionary entry: speak for