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.

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.

3. Fig.: Power; might; strength; support; as, the secular arm; the arm of the law.

To whom is the arm of the Lord revealed? Isa. lii. 1.

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.

Arm , n. [See Arms.] (Mil.)(a) A branch of the military service; as, the cavalry arm was made efficient. (b) A weapon of offense or defense; an instrument of warfare; -- commonly in the pl.

Arm , v. t. [imp. & p. p.Armed (?); p. pr. & vb. n. Arming.] [OE. armen, F. armer, fr. L. armare, fr. arma, pl., arms. See arms.]

"1. To take by the arm; to take up in ones arms. [Obs.]"

And make him with our pikes and partisans A grave: come, arm him. Shak.

Arm your prize; I know you will not lose him. Two N. Kins.

2. To furnish with arms or limbs. [R.]

His shoulders broad and strong,Armed long and round. Beau. & Fl.

3. To furnish or equip with weapons of offense or defense; as, to arm soldiers; to arm the country.

Abram . . . armed his trained servants. Gen. xiv. 14.

4. To cover or furnish with a plate, or with whatever will add strength, force, security, or efficiency; as, to arm the hit of a sword; to arm a hook in angling.

5. Fig.: To furnish with means of defense; to prepare for resistance; to fortify, in a moral sense.

Arm yourselves . . . with the same mind. 1 Pet. iv. 1.

To arm a magnet, to fit it with an armature.

Arm , v. i. To provide one\s self with arms, weapons, or means of attack or resistance; to take arms. " \Tis time to arm." Shak.

-- Webster's unabridged 1913