Meaning of “upstream” in the English Dictionary

"upstream" in British English

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upstreamadverb, adjective [ before noun ]

uk /ˌʌpˈstriːm/ us /ˌʌpˈstriːm/

(Definition of “upstream” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"upstream" in American English

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upstreamadjective, adverb [ not gradable ]

us /ˌʌpˈstrim/

against the current toward the starting point of a river:

Rowing upstream was hard going.

(Definition of “upstream” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"upstream" in Business English

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upstreamadjective [ before noun ]

uk /ˌʌpˈstriːm/ us

relating to something that happens earlier in a process or series of events:

The company's upstream business includes oil exploration and production.
upstream
adverb

They are working upstream to try and prevent such a situation happening again.

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(Definition of “upstream” from the Cambridge Business English Dictionary © Cambridge University Press)