dead set

[ded set for 1, 2; ded set for 3]
noun
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.

Origin:
1840–50, Americanism

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
  alterations.
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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