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

 

speak to

 phrasal verb
phrasal verb
 
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Phrasal Verbs

speak to somebody (about something)

(informal)
 
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to talk to someone in a serious way about something wrong they have done, to try to stop them from doing it again This is the third time I've had to speak to him about being late.
See the Oxford Advanced Learner's Dictionary entry: speak to