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English definition of “improve on/upon sth”

improve on/upon sth

verb [I or T] uk phrasal verb with improve   /ɪmˈpruːv/ us  
to do something in a better way or with better results than before: Last time she ran the race in 20 minutes, so she's hoping to improve on that.
(Definition of improve on/upon sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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