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Verb: befog (befogged,befogging)  bi'fóg or bee'fóg [N. Amer], bi'fóg [Brit]
  1. Make less visible or unclear
    "The heavy mist befogged the entire landscape";
    - obscure, becloud, obnubilate, haze over, fog, cloud, mist

Derived forms: befogs, befogging, befogged

Type of: conceal, hide