Pronunciation: (un"dur-sel'), [key]
—v.t., -sold, -sell•ing.
1. to sell more cheaply than.
2. to advertise with restraint; understate the merits of (something): By underselling his product, he let his hearers convince themselves of its importance.
3. to sell for less than the actual value.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.