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.
Words nearby knock dead
How to use knock dead in a sentence
The cartoonist, better known as Charb, was shot dead Wednesday.France Kills Charlie Hebdo Murderers|Nico Hines|January 9, 2015|DAILY BEAST
A policewoman was shot dead this morning while law enforcement searched for the Charlie Lebdo killers.France Mourns—and Hunts|Nico Hines, Christopher Dickey|January 8, 2015|DAILY BEAST
Absent a body, no one can say with absolute certainty whether Castro is dead, even if all signs point in that direction.
The two-state solution to the Israeli-Palestinian conflict is dead.In the Middle East, the Two-State Solution Is Dead|Dean Obeidallah|January 2, 2015|DAILY BEAST
Yes, Byrd—dead four-and-a-half years now—was a Kleagle in the Ku Klux Klan.Steve Scalise and the Right’s Ridiculous Racial Blame Game|Michael Tomasky|January 2, 2015|DAILY BEAST
A little boy of four was moved to passionate grief at the sight of a dead dog taken from a pond.Children's Ways|James Sully
When he plays a sonata it is as if the composition rose from the dead and stood transfigured before you.
To-day I'm more dead than alive, as we had a lesson from him yesterday that lasted four hours.
It is a fearsome thing for a man to be left alone in the dead of night with a young baby.The Joyous Adventures of Aristide Pujol|William J. Locke
If they are Ancients and dead then let them be buried and left to the archæological excavator.The Salvaging Of Civilisation|H. G. (Herbert George) Wells