What is "peak arch"

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.