haunch
Haunch (noun) means the hip, buttock and top of the thigh together, on one side of the body, especially in an animal that can sit back on its haunches.
Etymology
Traces back through Middle English haunche and hanche to Old French hanche, hance and anche (compare French hanche, Italian anca), from a Germanic source, probably Frankish *ankijā, from Proto-Germanic *ankijǭ ("joint; ankle"), from Proto-Indo-European *ang- ("joint; lith"). It is cognate with Old High German ancha, encha and einka ("the leg; joint, bend") (compare Old High German anchila, enchila ("ankle"), German Hanke ("haunch") and West Frisian hancke ("haunch")). Related further to ankle.