Entry from British & World English dictionary
1An injury caused by a numbing blow with the knee to a person’s upper leg: the striker was taken off with a dead leg 2A length of pipe running from a hot water cylinder to the hot taps.
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(dead-leg) [with object] informal Give (someone) a numbing blow to the upper leg with one’s knee: Mucker dead-legged him and Andy groaned, sinking to one knee
Definition of dead leg in: