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

 

pipe up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

pipe up (with something)

 
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(informal) to begin to speak The person next to me piped up with a silly comment. + speech ‘I know the answer,’ piped up a voice at the back of the room.
See the Oxford Advanced American Dictionary entry: pipe up