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tranquillizer

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noun [countable] British English pronunciation: tranquillizer /ˈtræŋkwɪlaɪzə(r)/ 
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singulartranquillizer
pluraltranquillizers
  1. a drug that makes people calmer when they are very worried or nervous
    be on tranquillizers (=take them regularly):

    She's been on tranquillizers ever since the accident.

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