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From The Collaborative International Dictionary of English v.0.48:
Arm \Arm\, n. [AS. arm, earm; akin to OHG. aram, G., D., Dan., & Sw. arm, Icel. armr, Goth. arms, L. armus arm, shoulder, and prob. to Gr. ? joining, joint, shoulder, fr. the root ? to join, to fit together; cf. Slav. rame. ?. See Art, Article.] 1. The limb of the human body which extends from the shoulder to the hand; also, the corresponding limb of a monkey. [1913 Webster] 2. Anything resembling an arm; as, (a) The fore limb of an animal, as of a bear. (b) A limb, or locomotive or prehensile organ, of an invertebrate animal. (c) A branch of a tree. (d) A slender part of an instrument or machine, projecting from a trunk, axis, or fulcrum; as, the arm of a steelyard. (e) (Naut) The end of a yard; also, the part of an anchor which ends in the fluke. (f) An inlet of water from the sea. (g) A support for the elbow, at the side of a chair, the end of a sofa, etc. [1913 Webster] 3. Fig.: Power; might; strength; support; as, the secular arm; the arm of the law. [1913 Webster] To whom is the arm of the Lord revealed? --Isa. lii. 1. [1913 Webster] Arm's end, the end of the arm; a good distance off. --Dryden. Arm's length, the length of the arm. Arm's reach, reach of the arm; the distance the arm can reach. To go (or walk) arm in arm, to go with the arm or hand of one linked in the arm of another. "When arm in armwe went along." --Tennyson. To keep at arm's length, to keep at a distance (literally or figuratively); not to allow to come into close contact or familiar intercourse. To work at arm's length, to work disadvantageously. [1913 Webster]