dead set against

Idioms & Phrases

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.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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