(Isa. 52:10; 53:1; Mosiah 14:1)
To “make bare the arm” is a metaphorical expression denoting preparation for active work, especially for war. The beauty of the figure is seen, not only in the fact that the arm is an appropriate emblem of power, but also in the additional fact that the Oriental costume permits the arm to be bared in an instant. Jowett says: “The loose sleeve of the Arab shirt, as well as of the outer garment, leaves the arm so completely free, that in an instant the left hand, passing up the right arm, makes it bare; and this is done when a person, a soldier, for example, about to strike with his sword, intends to give the arm full play.”
(James M. Freeman, Manners and Customs of the Bible [Plainfield, New Jersey: Logos International, 1972], 274.)