transcription, транскрипция: [ ʌpstri:m ]
Something that is moving upstream is moving towards the source of a river, from a point further down the river. Something that is upstream is towards the source of a river.
The water rose high enough for them to continue upstream.
...the river police, whose headquarters are just upstream of the Isle St Louis...
≠ downstream
ADV : ADV after v , be ADV , n ADV , oft ADV of/from n
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Upstream is also an adjective.
Steps lead down to the subway from the upstream side.
≠ downstream
ADJ : ADJ n