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ass  /s/  n. asses 1 a donkey: The ass is often used as a pack animal in remote mountain terrains. 2 vulg.slang the buttocks 3 infrml.fig. to make an ass of oneself: to behave stupidly: When he drinks too much, he makes an ass of himself.

Usage Note: To describe a part of the body, ass is a vulgar term and should not be used in polite company. In American English, the terms posterior and buttocks are used in formal speech and writing: The firefighter was badly burned on his legs and buttocks. Bottom is an informal term used around friends and acquaintances: My mother spanked my bottom when I hit my baby brother.