zonk out

v. fall fast asleep; lose consciousness (from using illegal drugs or consuming a large amount of alcohol)

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Verb
1. lose consciousness due to a sudden trauma, for example
(synonym) pass out, black out
(hypernym) change state, turn
(hyponym) faint, conk, swoon, pass out
2. fall asleep fast, as when one is extremely tired; "after the long drive, we zonked out and slept for 10 hours"
(hypernym) fall asleep, dope off, flake out, drift off, nod off, drop off, doze off, drowse off

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