noun

• (anatomy) The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand.
  "She stood with her right arm extended and her palm forward to indicate “Stop!”"
• (anatomy) 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."
• (geography) A bay or inlet off a main body of water.
  "Shelburne Bay is an arm of Lake Champlain."
• (figurative) Power; might; strength; support.
  "the arm of the law"

verb

• (obsolete) 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."

adj

• (UK dialectal, chiefly Scotland) Poor; lacking in riches or wealth.
• (UK dialectal, chiefly Scotland) To be pitied; pitiful; wretched.

noun

• (usually used in the plural) 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."
• (in the plural) Heraldic bearings or insignia.
  "The Duke's arms were a sable gryphon rampant on an argent field."
• (in the plural, obsolete) War; hostilities; deeds or exploits of war.