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Longman Dictionary of Contemporary English
unmentionables
noun
EXAMPLES FROM CORPUS
▪ A litany of nits, ringworm, fleas and unmentionables ... But as the weeks and months passed, everything changed.
The Collaborative International Dictionary
unmentionables

Inexpressibles \In`ex*press"i*bles\, n. pl. Breeches; trousers;; underwear generally, especially women's; -- now usually referred to as unmentionables. [Colloq. or Slang]
--Ld. Lytton.

Wiktionary
unmentionables

n. 1 (context plurale tantum English) undergarments, underwear, drawers 2 (context plurale tantum obsolete English) breeches, trousers

Usage examples of "unmentionables".

I had a week at most at my disposal, so for three or four nights I set off stealthily after dark, dressed in an ancient pea jacket and patched unmentionables, with a muffler and billycock hat and cracked boots, Galand in one pocket and flask in t'other, skulking round Conduit Street to see what his movements were.