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English definition of “upstream”

upstream

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