Definitions of siphon:

• noun:   a tube running from the liquid in a vessel to a lower level outside the vessel so that atmospheric pressure forces the liquid through the tube
• verb:   move a liquid from one container into another by means of a siphon or a siphoning action

  Example: "Siphon gas into the tank"

• verb:   convey, draw off, or empty by or as if by a siphon