Definition of strike down phrasal verb from the Oxford Advanced American 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 someone unable to lead an active life; to make someone seriously ill; to kill someone He was struck down by cancer at the age of thirty.
  2. 2to hit someone very hard, so that they fall to the ground

strike something down

 
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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 Learner's Dictionary entry: strike down