EDGE

ej: Very frequently occurs in the phrase "the edge of the sword" (Joshua 10:28, et al.) from the Hebrew peh, "lip," or saphah, "lip." Exodus 28:7 and Exodus 39:4 read "ends," from qatsah, "end" (the King James Version "edge"), and Joshua 13:27 has "uttermost part" for the same Hebrew word (the King James Version "edge"). In Jeremiah 31:29 and Ezekiel 18:2, "The children's teeth are set on edge" (qahah, "to be blunt"), i.e. set hard one against another.

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.