Definition of "dead set" []

• The rigid pose a hunting dog assumes when pointing out game to a hunter. (noun)
• By extension, a determined effort. (noun)
• Unswervingly dedicated; resolutely determined (adjective)

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• "That set the fire-bells ringing from Charleston to the Gulf, and with the South suddenly dead set against annexation — why Canada never did join the U.S.A., did she?"
• "If Bruce knew the Taipings were dead set on Shanghai, he'd have time to reinforce, perhaps even send for Grant."
• "If we could give everybody in town the idea that we, the Selectmen, were dead set against this kind of thing, it might help."