Source : Webster's Revised Unabridged Dictionary (1913)

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}.]

   {Jagging iron}, a wheel with a zigzag or jagged edge for
      cutting cakes or pastry into ornamental figures.

Source : WordNet®

jagging
     See {jag}

jag
     v : cut teeth into; make a jagged cutting edge
     [also: {jagging}, {jagged}]

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
     [also: {jagging}, {jagged}]