1. Declare null and void; make ineffective
   "strike down a law";
   - cancel
    
2. Cause to die, especially suddenly
   "The disease struck down many young men in the village"
    
3. Cause to fall by or as if by delivering a blow
   "Lightning struck down the hikers"; "strike down a tree";
   - fell, drop, cut down

Derived forms: striking down, strikes down, struck down

Type of: adjudge, cut, declare, hold, kill