plural of master-at-arms

(UK, Navy) A warrant officer or chief petty officer responsible for discipline aboard a naval ship.

(military, usually as imperative) To carry one's personal firearm diagonally in front of the body.

(military) The position of a weapon carried diagonally in front of the body.

(idiomatic, transitive, intransitive) to supply, or be supplied with, arms (weapons)

(historical) A sword seen as a being a part of someone's set of arms or military accoutrements; a warrior's regimental or official sword.

plural of arming sword

plural of spiral arm

(astronomy) A section of a spiral galaxy that coils out from the centre.

plural of arms race