dead set against
Completely opposed to, as in His parents were dead set against John's taking a year off from college. Set against has been used to mean “opposed to” since the 1400s. Dead acquired the meaning “utterly” in the 16th century.
Think Shrievalty’s Dead? Find Out With This Word Of The Day QuizWe can't lend Abram our candelabrum because we're too busy taking this week's Word of the Day Quiz.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.