dead set
[ ded set for 1, 2; ded set for 3 ]
/ ˈdɛd ˈsɛt for 1, 2; ˈdɛd ˌsɛt for 3 /
adjective
firmly decided or determined; resolved: His family was dead set against the marriage.
noun
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.
Origin of dead set
An Americanism dating back to 1840–50