tranquillize

from WordNet (r) 3.0 (2006)
tranquillize
    v 1: make calm or still; "quiet the dragons of worry and fear"
         [syn: {calm}, {calm down}, {quiet}, {tranquilize},
         {tranquillize}, {tranquillise}, {quieten}, {lull}, {still}]
         [ant: {agitate}, {charge}, {charge up}, {commove},
         {excite}, {rouse}, {turn on}]
    2: cause to be calm or quiet as by administering a sedative to;
       "The patient must be sedated before the operation" [syn:
       {sedate}, {calm}, {tranquilize}, {tranquillize},
       {tranquillise}] [ant: {arouse}, {brace}, {energise},
       {energize}, {perk up}, {stimulate}]
    
from The Collaborative International Dictionary of English v.0.48
Tranquilize \Tran"quil*ize\, Tranquillize \Tran"quil*lize\, v.
   t. [imp. & p. p. {Tranquilized}or {Tranquilliized}; p. pr. &
   vb. n. {Tranquilizing}or {Tranquillizing}.] [Cf. F.
   tranquilliser.]
   To render tranquil; to allay when agitated; to compose; to
   make calm and peaceful; as, to tranquilize a state disturbed
   by factions or civil commotions; to tranquilize the mind.
   [1913 Webster]

   Syn: To quiet; compose; still; soothe; appease; calm; pacify.
        [1913 Webster] Tranquilizer
    

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