A Quick and Simple Dictionary

arm

1. (initialism) .  accelerated reply mail: a service of the United States Postal Service.
2. (initialism) .  adjustable rate mortgage.
3. (abbreviation) .  Armenian.
4. Noun.  The portion of the upper human appendage, from the shoulder to the wrist and sometimes including the hand.
5. Noun.  (anatomy) The extended portion of the upper limb, from the shoulder to the elbow.
6. Noun.  A long, narrow, more or less rigid part of an object extending from the main part or centre of the object, such as the arm of an armchair, a crane, a pair of spectacles or a pair of compasses.
7. Noun.  A bay or inlet off a main body of water.
8. Adjective.  (context, UK) Poor; lacking in riches or wealth.
9. Adjective.  (context, UK) To be pitied; pitiful; wretched.
10. Noun.  (context, usually used in the plural) A weapon.
11. Noun.  (context, in plural) heraldic bearings or insignia.
12. Verb.  To supply with a weapon or weapons.
13. Verb.  To prepare a tool or a weapon for action, to activate.