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plural underpetticoats
(now chiefly historical) A petticoat worn under a skirt or another petticoat. quotations
I beheld the charmingest creature in the world, supporting herself on the arm of the gasping Dorcas, sighing, trembling, and ready to faint, with nothing on but an under-petticoat […] .
1748, [Samuel Richardson], “Letter CCXXV”, in Clarissa. Or, The History of a Young Lady: […], volumes (please specify |volume=I to VII), London: […] S[amuel] Richardson; […]