adjective
Toward the lower part of a stream; with the current (of a river, brook, or other flow of fluid).
(figurative) Occurring later than something else; (also, usually, especially) influenced by something else; being a consequence of something else.
adverb
Following the path of a river or stream.
verb
To stream downward.
(open-source software, transitive) Of the original developers: to make available (a version or patch) to downstream developers and users of the software.