strike down

(verb) declare null and void; make ineffective. Synonyms: cancel, strike down. Examples: "Cancel the election results." "Strike down a law."

(verb) cause to die, especially suddenly. Synonyms: strike down. Example: "The disease struck down many young men in the village."

(verb) cause to fall by or as if by delivering a blow. Synonyms: fell, drop, strike down, cut down. Examples: "Strike down a tree." "Lightning struck down the hikers."