river

river /ˈrɪvɚ/ noun
plural rivers
river
/ˈrɪvɚ/
noun
plural rivers
Britannica Dictionary definition of RIVER
[count]
1 
: a large natural flow of water that crosses an area of land and goes into an ocean, a lake, etc.
— see color picture on this page; compare stream
2 
: a large flow of something — often + of

sell (someone) down the river

— see 1sell

up the river

US, old-fashioned + informal
: to prison