Pronunciation: (lī'vun), [key]
to put life into; rouse; enliven; cheer (often fol. by up): What can we do to liven up the party?
to become more lively; brighten (usually fol. by up): If this party doesn't liven up soon, let's leave.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.