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Verb: invigilate  in'vi-ju,leyt
Usage: Brit
  1. Watch over (students taking an exam, to prevent cheating)
    "teachers have to invigilate exams";
    - proctor [N. Amer]

Derived forms: invigilated, invigilates, invigilating

Type of: follow, keep an eye on, observe, watch, watch over