(historical) A heavily-armed mounted member of medieval cavalry.

a light, balanced arm that holds the pickup cartridge on a record player

plural of coat of arms

plural of long arm

(slang, UK) An individual who steals things or borrows them without asking.

plural of sergeant-at-arms

A person charged with keeping order at a meeting.

An injection of a drug into the arm, whether for medical or recreational purposes. / (by extension) A stimulus; a boost in energy, morale, or well-being.

Alternative spelling of yardarm

(fencing) The arm in which one's sword is normally held.