mod. sound asleep. : After all that exercise, he's dead to the world.
mod. alcohol intoxicated. : By midnight almost everybody was dead to the world.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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American Heritage
Idioms & Phrases
dead to the world
Sound asleep or unconscious, as in The alarm clock went off but Joseph was dead to the world. [Late 1800s]