'tranquillise' definitions:

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]

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]