Definition: sneak

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Source: WordNet (r) 1.7 

sneak
     adj : marked by quiet and caution and secrecy; taking pains to
           avoid being observed; "a furtive manner"; "a lurking
           prowler"; "a sneak attack"; "stealthy footsteps"; "a
           surreptitious glance at his watch"; "someone skulking
           in the shadows" [syn: furtive, lurking, skulking,
            sneak, sneaky, stealthy, surreptitious]
     n 1: someone who prowls or sneaks about; usually with unlawful
          intentions [syn: prowler, stalker]
     2: someone acting as an informer or decoy for the police [syn:
        fink, snitch, snitcher, stoolpigeon, stoolie, sneaker,
         canary]
     v 1: to go stealthily or furtively: "..stead of sneaking around
          spying on the neighbor's house" [syn: mouse, creep,
          steal, pussyfoot]
     2: put, bring, or take in a secretive or furtive manner: "sneak
        a look"; "sneak a cigarette"
     3: make off with belongings of others [syn: pilfer, cabbage,
         purloin, pinch, abstract, snarf, swipe, hook,
         filch, nobble, lift]
     4: pass on stealthily; "He slipped me the key when nobody was
        looking" [syn: slip]

Source: Webster's Revised Unabridged Dictionary (1913) 

Sneak \Sneak\, v. t.
   To hide, esp. in a mean or cowardly manner. [Obs.]
   ``[Slander] sneaks its head.'' --Wake.
Sneak \Sneak\, n.
   1. A mean, sneaking fellow.

            A set of simpletons and superstitious sneaks.
                                                  --Glanvill.

   2. (Cricket) A ball bowled so as to roll along the ground; --
      called also grub. [Cant] --R. A. Proctor.
Sneak \Sneak\ (sn[=e]k), v. i. [imp. & p. p. Sneaked
   (sn[=e]kt); p. pr. & vb. n. Sneaking.] [OE. sniken, AS.
   sn[=i]can to creep; akin to Dan. snige sig; cf. Icel.
   sn[=i]kja to hanker after.]
   1. To creep or steal (away or about) privately; to come or go
      meanly, as a person afraid or ashamed to be seen; as, to
      sneak away from company.