arm

noun15

1. •
   a part of the human body from the shoulder down to where the hand begins, and sometimes the hand as well

   • She stood with her right arm extended and her palm forward to indicate “Stop!”
2. •
   The extended portion of the upper limb, from the shoulder to the elbow.

   • The arm and forearm are parts of the upper limb in the human body.
3. •
   A limb, or locomotive or prehensile organ, of an invertebrate animal.
4. •
   A long, narrow, more or less rigid part of an object extending from the main part or centre of the object, such as the armrest of an armchair, a crane, a pair of spectacles or a pair of compasses.

   • The robot arm reached out and placed the part on the assembly line.
   • I accidentally sat on my glasses and bent one of the arms.
5. •
   A bay or inlet off a main body of water.

   • Shelburne Bay is an arm of Lake Champlain.
6. •
   A branch of an organization.

   • Congress has asked the Government Accountability Office, its investigative arm, to review the workplace complaints raised by air marshals, said Charles Young, a spokesman for the office. — 2018
7. •
   A group of patients in a medical trial.
8. •
   A weapon.

   • A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed. — 1789
9. •
   The part of a piece of clothing that covers the arm.

   • […] one arm of this jacket streamed behind him like the broidered arm of a huzzar’s surcoat. — 1851
10. •
    (figurative) Power; might; strength; support.

    • To whom is the arm of the Lord revealed? — 1611
11. •
    [in the plural] Heraldic bearings or insignia.

    • The Duke's arms were a sable gryphon rampant on an argent field.
12. •
    (slang) A pitcher

    • The team needs to sign another arm in the offseason.
13. •
    One of the two parts of a chromosome.
14. •
    (South-Africa, slang) A quantity of dagga leaves rolled up in paper into a thick cylinder.

    • They scored an arm of dagga and some speed and then raced away. — 2014
15. •
    [in the plural] (no longer used) War; hostilities; deeds or exploits of war.

verb8

1. •
   To supply with armour or (later especially) weapons.

   • The king armed his knights with swords and shields.
2. •
   To take up weapons; to arm oneself.

   • The sergeant sent out an order to arm the team for the next mission.
3. •
   (figurative) To supply with the equipment, knowledge, authority, or other tools needed for a particular task; to furnish with capability; to equip.

   • thou gettest no more of me. For I am sure thy Office doth not arme thee with such authoritie. — 1593
4. •
   To prepare (a tool, weapon, or system) for action; to activate.

   • Remember to arm the alarm system before leaving for work.
5. •
   To become prepared for action; to activate.
6. •
   To cover or furnish with a plate, or with whatever will add strength, force, security, or efficiency.
7. •
   To fit (a magnet) with an armature.
8. •
   (no longer used) To take by the arm; to take up in one's arms.

   • And make him with our pikes and partisans / A grave: come, arm him. — 1611

adjective2

1. •
   (dialect, UK) Poor; lacking in riches or wealth.
2. •
   (dialect, UK) To be pitied; pitiful; wretched.

noun2

1. •
   Initialism of adjustable rate mortgage.
2. •
   Initialism of accelerated reply mail, a service of the United States Postal Service.

adjective1

1. •
   Abbreviation of Armenian.