/ ˈkɔːsɪt; NAmE ˈkɔːrsɪt/ noun
a piece of women's underwear, fitting the body tightly, worn especially in the past to make the waist look smaller
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WORD ORIGIN
Middle English : from Old French , diminutive of cors body, from Latin corpus . The sense close-fitting undergarment dates from the late 18th cent., by which time the sense bodice had mainly historical reference.