A military establishment for the storing, development, manufacturing, testing, or repairing of arms, ammunition, and other war materiel; an armoury.

(inorganic chemistry) A poisonous, white crystalline compound, H₃AsO₄, formed from arsenic pentoxide and water; it has the same structure as phosphoric acid, and is used in the manufacture of arsenates.

(Australia, New Zealand, Britain, idiomatic, vulgar) Tumbling; falling; upside-down, unstable or unbalanced.

(Britain, informal, vulgar) A hairstyle in which the hair is swept back along the sides of the head to meet in a point at the back, thus resembling the tail feathers of a duck.

(Britain, colloquial, mildly vulgar) Extremely drunk.

(idiomatic, archaic, slang) to hang back, to be afraid to advance.

(idiomatic, rare) To sit down.

(idiomatic, slang, vulgar, obsolete) A common reply to any question; once common at court and among sailors, under the name of "selling bargains".

Alternative form of arse around / (obsolete, slang) To turn round.

(slang) The wrong way round; exactly opposite to that which is desirable; contrary; conceptually inverted; wrong.