dead set

[ded set for 1, 2; ded set for 3]
firmly decided or determined; resolved: His family was dead set against the marriage.
a serious or determined attempt; firm effort: He made a dead set at winning the championship.
Hunting. the stiff posture assumed by a hunting dog in indicating the presence and location of game.

1840–50, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dead set
1.  absolutely: he is dead set against going to Spain
2.  the motionless position of a dog when pointing with its muzzle towards game
3.  (of a hunting dog) in this position
4.  slang (Austral) an expression of affirmation: dead set, I worked from dawn to dusk

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
That's why both parties are dead set on amending it.
The medical consensus is dead set against creating heritable genetic
Part of the problem was that her lawyers were dead set against her writing
  anything that characterized her testimony.
The sociopaths and vampires are dead set on causing havoc and destroying all of
  human civilization for their own personal gain.
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