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WordNet (r) 3.0 (2006) (WordNet)

tranquillize
v 1: make calm or still; "quiet the dragons of worry and fear"
[synonym: {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" [synonym:
{sedate}, {calm}, {tranquilize}, {tranquillize},
{tranquillise}] [ant: {arouse}, {brace}, {energise},
{energize}, {perk up}, {stimulate}]