Source : Webster's Revised Unabridged Dictionary (1913)

Shill \Shill\, v. t.
   To shell. [Obs. or Prov. Eng.]

Shill \Shill\, v. t. [Cf. {Sheal}.]
   To put under cover; to sheal. [Prov.ng.] --Brockett.

Source : WordNet®

shill
     n : a decoy who acts as an enthusiastic customer in order to
         stimulate the participation of others
     v : act as a shill; "The shill bid for the expensive carpet
         during the auction in order to drive the price up"