English

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

 

take up with

 phrasal verb
phrasal verb
 
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Phrasal Verbs
(informal) to begin to be friendly with somebody, especially somebody with a bad reputation

take something up with somebody

 
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to speak or write to somebody about something that they may be able to deal with or help you with They decided to take the matter up with their MP.
See the Oxford Advanced American Dictionary entry: take up with