(UK dialectal) Backwards; on one's arse.

plural of arsebreath

(slang, vulgar, offensive) An annoying or contemptible person.

(inorganic chemistry) The binary compound of arsenic and chlorine AsCl₅

(inorganic chemistry) The inorganic salt Ca₃(AsO₄)₂ that is used as a pesticide and germicide

arsenic trioxide, arsenious acid

(vulgar, slang) A buttock.

(vulgar, informal) Of, pertaining to, or being an arsehole.

(politics, figuratively) The United States of America, as supplier of extensive materiel support to U.S. allies during World War II; or post-war U.S. as the manufacturer and possessor of the greatest quantity of advanced military weaponry in the world, in the service of defending democratic forms of government.

Alternative form of arsenal of democracy