Real Dictionary

corset
countable noun: A corset is a stiff piece of underwear worn by some women, especially in the past. It fits tightly around the hips and waist and makes the person wearing it look thinner.

corset in American English
a closefitting undergarment, often tightened with laces and reinforced with stays, worn, chiefly by women, to give support or a desired figure to the body from the hips to or including the breast
to dress in, fit with, or enclose as in a corset
noun: a close-fitting undergarment, stiffened with whalebone or similar material and often capable of being tightened by lacing, enclosing the trunk: worn, esp. by women, to shape and support the body; stays
transitive verb: to dress or furnish with or as if with a corset

corset in British English
noun: a stiffened, elasticated, or laced foundation garment, worn esp by women, that usually extends from below the chest to the hips, providing support for the spine and stomach and shaping the figure
verb: to dress or enclose in, or as in, a corset