Pronunciation: (ded'n), [key]
1. to make less sensitive, active, energetic, or forcible; weaken: to deaden sound; to deaden the senses; to deaden the force of a blow.
2. to lessen the velocity of; retard: to deaden the headway of a ship.
3. to make impervious to sound, as a floor.
to become dead.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.