sit-upons en · NOUN
Meanings
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(form-of, plural) plural of sit-upon
form of sit-upon
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(UK, obsolete, slang) Trousers.
But I should advise you, old fellow, to get your sit-upons seated with wash-leather,—just like the eleventh hussars do with their cherry-coloured pants.
1860, Cuthbert Bede, The Adventures of Mr. Verdant Green, volumes 1-3, page 89: