Source : Webster's Revised Unabridged Dictionary (1913)

Shab \Shab\, n. [OE. shabbe, AS. sc?b. See {Scab}.]
   The itch in animals; also, a scab. [Obs. or Prov. Eng.]

Shab \Shab\, v. t. [imp. & p. p. {Shabbed}; p. pr. & vb. n.
   {Shabbing}.] [See {Scab}, 3.]
   To play mean tricks; to act shabbily. [Obs. or Prov. Eng.]

Shab \Shab\, v. t.
   To scratch; to rub. [Obs.] --Farquhar.