zonk out

World English Dictionary
zonk out
 
vb
slang (intr, adverb) to fall asleep, esp from physical exhaustion or the effects of alcohol or drugs

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WordNet
zonk out

verb
1. lose consciousness due to a sudden trauma, for example 
2. fall asleep fast, as when one is extremely tired; "after the long drive, we zonked out and slept for 10 hours" 
WordNet® 3.0, © 2006 by Princeton University.
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