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Meaning of dead set

dead set

Pronunciation: (ded' set' for 1 2 ded' set&sec 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. 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.