a natural stream of water of considerable volume
a flow that matches a river in volume
a river of lava
(in pl) a copious or overwhelming quantity
He cried rivers of tears when she left
(used before a noun) inhabiting or relating to a river
a river dolphin
sell down the river
to betray (somebody) or destroy their faith or expectations
riverless adj
[Middle English from Old French rivere, ultimately from Latin riparius riparian, from ripa bank]