Definition of strike down phrasal verb from the Oxford Advanced Learner's Dictionary

 

strike down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    strike somebody down

    [usually passive]
     
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  1. 1(of a disease, etc.) to make somebody unable to lead an active life; to make somebody seriously ill; to kill somebody He was struck down by cancer at the age of thirty.
  2. 2to hit somebody very hard, so that they fall to the ground
(especially North American English) to decide that a law is illegal and should not apply The Supreme Court struck down a Texas state law. The law was struck down as unconstitutional.
See the Oxford Advanced American Dictionary entry: strike down