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Idioms and Phrases with dead from the neck up

dead from the neck up

Extremely stupid, as in That news commentator sounds dead from the neck up. This expression alludes to being “brain-dead.” [Early 1900s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.