arse
UK[ɑːs]US[ɑːrs]
n
The part of the body on which a person sits; the buttocks.
n
(Chiefly British, vulgar slang) A stupid, irritating, or contemptible person.
Etymology
The word 'arse' has a direct and ancient lineage from Proto-Germanic 'arsaz', which in turn descends from the Proto-Indo-European root 'ors-', meaning 'buttocks' or 'backside'. This root is widely attested across the Indo-European family, giving rise to similar words in Greek ('orrhos'), and through Latin ('ārsus'), it influenced the Romance languages. The term entered Old English as 'ærs' and has remained remarkably stable in its core anatomical meaning. Its vulgar and pejorative slang usages are secondary developments, common in many languages for body part terms, reflecting social taboos and the application of physical attributes to characterize behavior or intellect.
Analysis
This word is a simplex form. It is derived from the Old English word 'ærs' or 'ears', meaning 'buttocks' or 'rump'. Its functional role is as a standalone noun.
Examples
He fell flat on his arse.
Stop being such a pompous arse.
I've been working my arse off all week.