1. （四足动物的）后腿及后臀
    The hindquarters of a four-legged animal are its back part, including its two back legs.

1. the part of an animal that corresponds to the human buttocks

    Synonym: croupcrouperump

2. the fleshy part of the human body that you sit on

    e.g. he deserves a good kick in the butt
           are you going to sit on your fanny and do nothing?

    Synonym: buttocksnatesarsebuttbacksidebumbunscanfundamenthind endkeisterposteriorpratrearrear endrumpsternseattailtail endtooshietushbottombehindderrierefannyass