pool1
  
  n.
  - a small area of still water, typically one formed naturally. 
▸a deep place in a river.
 ▸a swimming pool.
 - a small, shallow patch of liquid lying on a surface.
 
v.
  - form a pool.
 - (of blood) accumulate in parts of the venous system.
 
 
  Etymology
  OE pōl, of W. Gmc origin.
 
  
    
pool2
  
  n.
    - a shared supply of vehicles, people, or resources to be drawn on when needed. 
▸a common fund into which all contributors pay and from which financial backing is provided.
 ▸the collective amount of players' stakes in gambling or sweepstakes.
 ▸
(the pools or football pools)
 a form of gambling on the results of football matches, the winners receiving large sums accumulated from entry money.
 - an arrangement between competing parties to fix prices and share business in order to eliminate competition.
 - a group of contestants who compete against each other in a tournament for the right to advance to the next round.
 - a game played on a billiard table using two sets of seven balls together with one black ball and a white cue ball.
 
v.
  - put (money or other assets) into a common fund. 
▸share for the benefit of all.
 - Austral. informal implicate or inform on.
 
 
  Etymology
  C17: from Fr. poule in the sense ‘stake, kitty’, assoc. with pool1.