Source : Webster's Revised Unabridged Dictionary (1913)

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.