Source : Webster's Revised Unabridged Dictionary (1913)

Peak \Peak\, v. i. [imp. & p. p. {Peaked}; p. pr. & vb. n.
   {Peaking}.]
   1. To rise or extend into a peak or point; to form, or appear
      as, a peak.

            There peaketh up a mighty high mount. --Holand.

   2. To acquire sharpness of figure or features; hence, to look
      thin or sicky. ``Dwindle, peak, and pine.'' --Shak.

   3. [Cf. {Peek}.] To pry; to peep slyly. --Shak.

   {Peak arch} (Arch.), a pointed or Gothic arch.

Peaking \Peak"ing\, a.
   1. Mean; sneaking. [Vulgar]

   2. Pining; sickly; peakish. [Colloq.]