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knock dead

Greatly amuse, astonish, or thrill someone, as in This new song will knock them dead . This slangy hyperbolic expression was first recorded in 1889. Also see knock the socks off
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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