1. Make calm or still
   - calm, calm down, quiet, tranquilize [N. Amer], tranquillize, quieten, lull, still 
2. Cause to be calm or quiet as by administering a sedative to
   - sedate, calm, tranquilize [N. Amer], tranquillize

Derived forms: tranquillises, tranquillised, tranquillising

See also: tranquilliser [Brit]

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

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