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"arse" not 'ass'; the latter means a donkey. Comment by: Phaser   

Not if your in America, it means both. Arse in British English. Comment by: Turkam   

yes that right. In English a final "r" is not a consonant but rather influences the vowel, the English have little "r- coloring" Dialects in England and then America are stronger in this therefore the confusion and it happens in other words where the "r" has been lost. Citations might go back to Shakespeare's time but certainly to the 18th century. Comment by: frank