Definition of tranquillize

verb (v)

• make calm or still (verb.emotion)

  Synonym: calm, calm down, lull, quiet, quieten, still, tranquilize, tranquillise
  Antonym: agitate, charge, charge up, commove, excite, rouse, turn on
  

  source: wordnet30
• cause to be calm or quiet as by administering a sedative to (verb.body)

  Synonym: calm, sedate, tranquilize, tranquillise
  Antonym: arouse, brace, energise, energize, perk up, stimulate
  

  source: wordnet30

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