improve on/upon sth
— phrasal verb with improve uk /ɪmˈpruːv/ us /ɪmˈpruːv/ verb [ I or T ]
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(Definition of “improve on/upon sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to make a surface shiny by putting a liquid substance onto it and leaving it or heating it until it dries