TRANQUILIZE
sedate, calm, tranquilize, tranquillize, tranquillise
(verb) cause to be calm or quiet as by administering a sedative to; “The patient must be sedated before the operation”
calm, calm down, quiet, tranquilize, tranquillize, tranquillise, quieten, lull, still
(verb) make calm or still; “quiet the dragons of worry and fear”
Source: WordNet® 3.1
Etymology
Verb
tranquilize (third-person singular simple present tranquilizes, present participle tranquilizing, simple past and past participle tranquilized)
(transitive) To calm (a person or animal) or put them to sleep using a drug.
Synonym: sedate
(transitive, now, literary) To make (something or someone) tranquil.
Synonyms: appease, calm, pacify
(intransitive, obsolete, rare) To become tranquil.
Synonyms: calm down, relax
Antonyms
• madden
Source: Wiktionary
Tran"quil*ize, Tran"quil*lize, v. t. [imp. & p. p. Tranquilized or
Tranquilliized; p. pr. & vb. n. Tranquilizing or Tranquillizing.]
Etym: [Cf. F. tranquilliser.]
Definition: 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.
Syn.
– To quiet; compose; still; soothe; appease; calm; pacify.
Source: Webster’s Unabridged Dictionary 1913 Edition