Definition of be onto phrasal verb from the Oxford Advanced American Dictionary

 

be onto

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    be onto somebody

     
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  1. 1(informal) to know about what someone has done wrong She knew the police would be onto them.
  2. 2to be talking to someone, usually in order to ask or tell them something They've been onto me for ages to get a job.

be onto something

 
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to know about something or be in a situation that could lead to a good result for you Scientists believe they are onto something big. She's onto a good thing with that new job.
See the Oxford Advanced Learner's Dictionary entry: be onto

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