SIT-UPONS

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NOUN
1. trousers, breeches ...1841 sl.
2. the buttocks; the posterior ...1942 Amer. sl. 

ETYMOLOGY
from sit (vb.)

EXAMPLE
From: The Parish Clerk
By Joseph Thomas J. Hewlett
Edited by Theodore Hook
Volume I, 1841
Chapter VII. The Twin Squires.
P. 126