Pronunciation: (up'un-doun'), [key]
1. moving alternately up and down: the up-and-down swing of levers; an up-and-down tune.
2. having an uneven surface: up-and-down countryside.
3. changeable: up-and-down luck.
4. perpendicular or nearly so: a straight up-and-down hillside.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.