zonk out

Verb
  1. Lose consciousness due to a sudden trauma, for example (synset 200023861)
    is a type of: change state, turn - undergo a transformation or a change of position or action
    subtypes: conk, faint, pass out, swoon - pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain
    same as: black out, pass out
  2. Fall asleep fast, as when one is extremely tired (synset 200016848)
    "after the long drive, we zonked out and slept for 10 hours"
    is a type of: dope off, doze off, drift off, drop off, drowse off, fall asleep, flake out, nod off - change from a waking to a sleeping state

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