'Downstream' definitions:

Definition of 'downstream'

From: WordNet
adverb
Away from the source or with the current [syn: downriver, downstream] [ant: upriver, upstream]
adjective
In the direction of a stream's current [ant: upstream]

Definition of 'Downstream'

From: GCIDE
  • Downstream \Down"stream`\, adv. Down the stream; as, floating downstream. [1913 Webster]