| 1. | Usually, arms. weapons, esp. firearms. |
| 2. | arms, Heraldry. the escutcheon, with its divisions, charges, and tinctures, and the other components forming an achievement that symbolizes and is reserved for a person, family, or corporate body; armorial bearings; coat of arms. |
| 3. | to enter into a state of hostility or of readiness for war. |
| 4. | to equip with weapons: to arm the troops. |
| 5. | to activate (a fuze) so that it will explode the charge at the time desired. |
| 6. | to cover protectively. |
| 7. | to provide with whatever will add strength, force, or security; support; fortify: He was armed with statistics and facts. |
| 8. | to equip or prepare for any specific purpose or effective use: to arm a security system; to arm oneself with persuasive arguments. |
| 9. | to prepare for action; make fit; ready. |
| 10. | bear arms,
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| 11. | take up arms, to prepare for war; go to war: to take up arms against the enemy. |
| 12. | under arms, ready for battle; trained and equipped: The number of men under arms is no longer the decisive factor in warfare. |
| 13. | up in arms, ready to take action; indignant; outraged: There is no need to get up in arms over such a trifle. |

arm 1 (ärm)
n.
An upper limb of the human body, connecting the hand and wrist to the shoulder.