Source : Webster's Revised Unabridged Dictionary (1913)

Sneaker \Sneak"er\, n.
   1. [pl.] Shoes with rubber or other soft soles which give no
      warning of one's approaching, esp. such shoes as are worn
      in games, as tennis. [Slang, U. S.]

   2. A punch bowl. [Obs.] --Spectator.

Sneaker \Sneak"er\, n.
   1. One who sneaks. --Lamb.

   2. A vessel of drink. [Prov. Eng.]

            A sneaker of five gallons.            --Spectator.

Source : WordNet®

sneaker
     n 1: a canvas shoe with a pliable rubber sole [syn: {gym shoe}, {tennis
          shoe}]
     2: someone acting as an informer or decoy for the police [syn:
        {fink}, {snitch}, {snitcher}, {stoolpigeon}, {stoolie}, {sneak},
         {canary}]