Pronunciation: (ded' set' for 1; 2; ded' set" for 3), [key]
1. firmly decided or determined; resolved: His family was dead set against the marriage.
2. a serious or determined attempt; firm effort: He made a dead set at winning the championship.
3. Hunting.the stiff posture assumed by a hunting dog in indicating the presence and location of game.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.