An instrument of attack or defense in combat or hunting, e.g. most guns, missiles, or swords; arm.

An instrument or other means of harming or exerting control over another.

(informal, humorous) A tool of any kind.

(Britain, slang, derogatory) An idiot, an oaf, a fool, a tool; a contemptible or incompetent person.

(Australia, slang) A very skilled, competent, or capable person or thing worthy of awe.

(rare, slang) The human genital organ.

(transitive) To equip with a weapon; to arm.