n the side of an object that is opposite its front
n the fleshy part of the human body that you sit on
n. 背部, 背后, 后方
1. She fell and landed on her backside.
她摔倒了，摔在了屁股上。
2. The dog wagged its tail and showed its backside to us.
狗摇着尾巴，向我们展示了它的后面。
3. He has a tattoo on his backside that he loves to show off.
他在屁股上有一个纹身，喜欢炫耀它。