Pronunciation: (un'dur-pin"ing), [key]
1. a system of supports beneath a wall or the like.
2. Often, underpinnings. a foundation or basis: to uncover the emotional underpinnings of an illness.
3. underpinnings, Informal.
a. underwear, esp. women's underwear.
b. the legs.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.