[ C ] mainly US offensive UK arse the part of the body that you sit on腚,屁股
[ U ] US offensive used by men to refer to sexual activity, or to women considered only as possible sexual partners(男性用语)性交;(视为性交对象的)女人
I've never seen so much gorgeous ass.我从没见过那么多的漂亮妞。
your ass mainly US offensive yourself你他妈的
Get your ass in my office now!你他妈的马上到我办公室来!