also downriver
Something that is moving down-river is moving towards the mouth of a river, from a point further up the river. Something that is down-river is towards the mouth of a river.
By 09.30 we had cast off and were heading down-river.
...a big tourist hotel a few hundred yards down-river...
Cologne is not so very far down-river from Mainz.
≠ up-river
ADV : ADV after v , be ADV , n ADV , oft ADV from n
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Down-river is also an adjective.
...downriver factories dispensing billows of smoke.
≠ up-river
ADJ : ADJ n