Source : Webster's Revised Unabridged Dictionary (1913)

Pump \Pump\, v. i.
   To work, or raise water, a pump.

Pump \Pump\, v. t. [imp. & p. p. {Pumped} (p[u^]mt; 215); p. pr.
   & vb. n. {pumping}.]
   1. To raise with a pump, as water or other liquid.

   2. To draw water, or the like, from; to from water by means
      of a pump; as, they pumped the well dry; to pump a ship.

   3. Figuratively, to draw out or obtain, as secrets or money,
      by persistent questioning or plying; to question or ply
      persistently in order to elicit something, as information,
      money, etc.

            But pump not me for politics.         --Otway.

Pump \Pump\ (p[u^]mp), n. [Probably so called as being worn for
   pomp or ornament. See {Pomp}.]
   A low shoe with a thin sole.

Pump \Pump\, n. [Akin to D. pomp, G. pumpe, F. pompe; of unknown
   origin.]
   An hydraulic machine, variously constructed, for raising or
   transferring fluids, consisting essentially of a moving piece
   or piston working in a hollow cylinder or other cavity, with
   valves properly placed for admitting or retaining the fluid
   as it is drawn or driven through them by the action of the
   piston.

Source : WordNet®

pump
     n 1: a mechanical device that moves fluid or gas by pressure or
          suction
     2: the hollow muscular organ located behind the sternum and
        between the lungs; its rhythmic contractions pump blood
        through the body; "he stood still, his heart thumping
        wildly" [syn: {heart}, {ticker}]
     3: a low-cut shoe without fastenings [syn: {pumps}]

pump
     v 1: operate like a pump; move up and down, like a handle or a
          pedal
     2: deliver forth; "pump bullets into the dummy"
     3: draw or pour with a pump
     4: supply in great quantities; "Pump money into a project"
     5: flow intermittently
     6: move up and down; "The athlete pumps weights in the gym"
     7: raise (gases oor fluids) with a pump
     8: question persistently; "She pumped the witnesses for
        information"