Etymology
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downstream (adv.)

"with or in the direction of the current of a stream," 1706, from the prepositional phrase; see down (adv.) + stream (n.). As an adjective by 1842. Middle English had the prepositional phrase down the water (c. 1400).

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Definitions of downstream
1
downstream (adv.)
away from the source or with the current;
Synonyms: downriver
2
downstream (adj.)
in the direction of a stream's current;
From wordnet.princeton.edu