Definition of zone out in English:

zone out

North American informal Fall asleep or lose concentration or consciousness: I just zoned out for a moment
More example sentences
  • Liz was already sitting there, front row centre among the geeks, yet she seemed to have, once again, zoned out and fallen asleep.
  • He sings Otis Redding's ‘Try a Little Tenderness’ and it's so boring I zone out and my eyeballs fall out.
  • This does more harm than good, as we tend to lose the thread and zone out.
See parent entry: zone

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Word of the day hubris
Pronunciation: ˈhjuːbrɪs
noun
excessive pride or self-confidence