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poisoned chalice noun

  /ˈpɔɪzn̩d ˈtʃælɪs/ , /ˈpɔɪzənd ˈtʃælɪs/
  • (idiomatic) Something which is initially regarded as advantageous but which is later recognized to be disadvantageous or harmful; an apparently beneficial or benign instrument or scheme for causing death or harm.
 cadeau empoisonné, tunique de Nessus
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