MEANING
Opposite a river's flow, toward its source.
Use it for
Words that belong together
- travel upstream
- upstream pollution
On the page
The leak was traced upstream to the mill.
Word forms
- Base
- upstream
Usage notes
Primary category: setting / environment. Forms: Invariable adverb. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Commonness: moderately common.
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