prat
  臀部
  prat
       n : 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,
            arse, butt, backside, bum, buns, can, fundament,
            hindquarters, hind end, keister, posterior, rear,
            rear end, rump, stern, seat, tail, tail end,
            tooshie, tush, bottom, behind, derriere, fanny,
            ass]