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English definition of “upstream”

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upstream

adverb, adjective [before noun] uk   /ˌʌpˈstriːm/ us  
(moving) on a river or stream towards its origin: Salmon swim upstream against very strong currents to reach their breeding areas. relating to an earlier stage in a process or series of events: The company's upstream business includes oil exploration and production.
Opposite
(Definition of upstream from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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