dead from the neck up

dead from the neck up idiom
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® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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