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sit-upon

[sit-uh-pon, -pawn]
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noun
  1. a piece of waterproof fabric or other material carried by campers, hikers, etc., and used for sitting on wet surfaces.
  2. Chiefly British Informal. the buttocks.

Origin of sit-upon

First recorded in 1835–45; noun use of verb phrase sit upon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018