downstream is an adverbial phrase that references beside the watercourse. It's the side where the tide runs out.
"Downstream" indicates the underside, the mouth side of a river. The mouth is the most "downstream" side of a river.
The word downstream means the sense in which the waters of a river flow descend. It is also the ebb of the tide, the low tide, the reflux where the sea lowers its waters. It is a term from the Latin "jusum", which means towards the mouth, ebb.
The downstream reference point can be a city on the riverbank, a waterfall, a dam, a bridge, etc. Everything below a certain point of reference, downstream, is said to be "downstream".
The antonym of the adverbial phrase "downstream" is "upstream", which refers to the side of the source of a river, to a point that rises.
in figurative language, the phrase "downstream" is used to refer to an event that occurred after a certain date. It is used in several areas, especially in the exact sciences.