Definition of "river"

noun:
- A large and often winding stream which drains a land mass, carrying water down from higher areas to a lower point, ending at an ocean or in an inland sea. Occasionally rivers overflow their banks and cause floods.
  
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- Any large flow of a liquid in a single body (e.g., 'a river of blood').
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
- The last card dealt in a hand.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
verb:
- To improve one's hand to beat another player on the final card in a poker game.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License