Dictionary![]() ![]() sit-up•onPronunciation: (sit'u-pon", -pôn"), [key] —n. 1. a piece of waterproof fabric or other material carried by campers, hikers, etc., and used for sitting on wet surfaces. 2. Chiefly Brit. Informal.the buttocks. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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