tranquilize tranquilize /ˈtræŋkwəˌlaɪz/

verb

1. [ N. American] Cause to be calm or quiet as by administering a sedative to  ( calm , sedate , tranquilize [ N. American] , tranquillise [British] , tranquillize )
   cause to be calm or quiet as by administering a sedative to
    The patient must be sedated before the operation
   The patient must be sedated before the operation
   
2. [ N. American] Make calm or still  ( calm down , lull , quieten [British] , calm , quiet , still , tranquilize [ N. American] , tranquillise [British] , tranquillize )
   make calm or still
    Quiet the dragons of worry and fear
   quiet the dragons of worry and fear