arse
  屁股
  Arse n.  The buttocks, or hind part of an animal; the posteriors; the fundament; the bottom.
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  arse
       n 1: the fleshy part of the human body that you sit on; "he
            deserves a good kick in the butt"; "are you going to sit
            on your fanny and do nothing?" [syn: buttocks, nates,
             butt, backside, bum, buns, can, fundament,
            hindquarters, hind end, keister, posterior, prat,
             rear, rear end, rump, stern, seat, tail, tail
            end, tooshie, tush, bottom, behind, derriere,
             fanny, ass]
       2: excretory opening at the end of the alimentary canal [syn: anus,
           arsehole, asshole]