Source : Webster's Revised Unabridged Dictionary (1913)

Gull \Gull\, v. t. [imp. & p. p. {Gulled}; p. pr. & vb. n.
   {Gulling}.] [Prob. fr. gull the bird; but cf. OSw. gylla to
   deceive, D. kullen, and E. cullibility.]
   To deceive; to cheat; to mislead; to trick; to defraud.

         The rulgar, gulled into rebellion, armed. --Dryden.

         I'm not gulling him for the emperor's service.
                                                  --Coleridge.

Gull \Gull\, n.
   1. A cheating or cheat; trick; fraud. --Shak.

   2. One easily cheated; a dupe. --Shak.

Gull \Gull\, n. [Of Celtic origin; cf. Corn. gullan, W. gwylan.]
   (Zo["o]l.)
   One of many species of long-winged sea birds of the genus
   {Larus} and allied genera.

   Note: Among the best known American species are the herring
         gull ({Larus argentatus}), the great black-backed gull
         ({L. murinus}) the laughing gull ({L. atricilla}), and
         Bonaparte's gull ({L. Philadelphia}). The common
         European gull is {Larus canus}.

   {Gull teaser} (Zo["o]l.), the jager; -- also applied to
      certain species of terns.

Source : WordNet®

gull
     n 1: a person who is gullible and easy to take advantage of [syn:
           {chump}, {fool}, {mark}, {patsy}, {fall guy}, {sucker},
           {soft touch}, {mug}]
     2: mostly white aquatic bird having long pointed wings and
        short legs [syn: {seagull}, {sea gull}]
     v 1: make a fool or dupe of [syn: {fool}, {befool}]
     2: fool or hoax; "The immigrant was duped because he trusted
        everyone"; "You can't fool me!" [syn: {dupe}, {slang}, {befool},
         {cod}, {fool}, {put on}, {take in}, {put one over}, {put
        one across}]