名詞 rear end:

1. the fleshy part of the human body that you sit on
   同義詞：buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass

動詞 rear end:

1. collide with the rear end of
   同義詞：rear-end

1. His mother was so annoyed with him that she swatted his rear end.
   他的媽媽被他惹惱了，狠狠地揍他的屁股。
2. The rear end of my car was smashed when we suddenly stopped and the car behind us hit us.
   當我們猛然剎車時，我們的車尾被后面的車撞壞了。