ass/æs; æs/ n [C] 1AmE a rude word for the part of your body that you sit on 【美】 屁股〔粗俗用语〕: Jamie fell right on his ass. 杰米一屁股摔在地上。 2informal someone who is behaving stupidly 【非正式】 傻瓜,笨蛋: Don't be such an ass! 别这么傻了! 3especially literary a DONKEY 【尤文】 驴