Definition of get on to phrasal verb from the Oxford Advanced American Dictionary

 

get on to

 phrasal verb
phrasal verb
 
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Phrasal Verbs

get on to somebody

 
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to become aware of someone's activities, especially when they have been doing something bad or illegal He had been stealing money from the company for years before they got on to him.

get on to something

 
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to begin to talk about a new subject It's time we got on to the question of costs.
See the Oxford Advanced Learner's Dictionary entry: get on to