The Collaborative International Dictionary of English v.0.48:

Sucker \Suck"er\, v. t. [imp. & p. p. Suckered; p. pr. & vb.
   n. Suckering.]
   1. To strip off the suckers or shoots from; to deprive of
      suckers; as, to sucker maize.
      [1913 Webster]

   2. To cheat or deceive (a gullible person); to make a sucker
      of (someone).
      [PJC]