adj
In a direction against the flow of a current or stream of fluid (typically water); upriver.
Occurring earlier than something else; (also, usually, especially) being an influence on something else; causing a consequence for something else.
Input entry is upstream of input validation in the runtime process.
Occurring earlier than something else; (also, usually, especially) being an influence on something else; causing a consequence for something else.
Occurring earlier than something else; (also, usually, especially) being an influence on something else; causing a consequence for something else.
Occurring earlier than something else; (also, usually, especially) being an influence on something else; causing a consequence for something else.
The outage was caused by an upstream error in a payments library.
You can also check the upstream and/or Debian bug trackers for open and closed bugs and the upstream revision history or newer release(s).
adv
Against the current.
In another moment a huge wave, like a muddy tidal bore, but almost scaldingly hot, came sweeping round the bend up-stream.
verb
To stream upward.
To have (a software library, patch, etc.) accepted by the original developers of the related software, so that they maintain and distribute it.
I'd be more than happy to upstream your patch.