jag \jag\, v. t. imp.  p. p. jagged; p. pr.  vb. n.
   jagging.
   to cut into notches or teeth like those of a saw; to notch.
   written also jagg.
   1913 webster

   jagging iron, a wheel with a zigzag or jagged edge for
      cutting cakes or pastry into ornamental figures.
      1913 webster
see also:
jagged jagging jagg jagging iron 

jagging
     see jag
see also:
jag 

jag
     n 1: a sharp projection on an edge or surface; "he clutched a jag
          of the rock"
     2: a slit in a garment that exposes material of a different
        color underneath; used in renaissance clothing
     3: a flap along the edge of a garment; used in medieval
        clothing syn: dag
     4: a bout of drinking or drug taking
     v : cut teeth into; make a jagged cutting edge
     also: jagging, jagged
see also:
dag jagging jagged