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From The Collaborative International Dictionary of English v.0.48:
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]