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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]

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