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English definition of “touch on/upon sth”

touch on/upon sth

verb uk phrasal verb with touch   /tʌtʃ/ us  
to mention a subject quickly when speaking or writing about another subject: The talk was about educational opportunities for adults, and the speaker also touched upon sources of finance.
(Definition of touch on/upon sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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