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Verb: tranquillise  'trang-kwi,lIz
Usage: Brit (N. Amer: tranquilize)
  1. Make calm or still
    "tranquillise the dragons of worry and fear";
    - calm, calm down, quiet, tranquilize [N. Amer], tranquillize, quieten [Brit], lull, still
  2. Cause to be calm or quiet as by administering a sedative to
    "The patient must be tranquillised before the operation";
    - sedate, calm, tranquilize [N. Amer], tranquillize

Derived forms: tranquillised, tranquillises, tranquillising

Type of: affect, comfort, console, solace, soothe

Antonym: energize