down-river , 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. adv ADV after v, be ADV, n ADV, oft ADV from n (Antonym: up-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.
Down-river is also an adjective., adj ADJ n (Antonym: up-river)
...downriver factories dispensing billows of smoke.