屁股
?buttocks;bottom;ass
? (of animals)rump; hindquarter
?protruding part on the back of an object
打某人的～give sb a spanking/替某人擦～clean up the mess for sb/老虎～摸不得like a tiger whose backside no one dares to touch—not to be provoked/汽車～ rear of a car /煙～cigarette butt