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