Definition of flake out phrasal verb from the Oxford Advanced Learner's Dictionary

 

flake out

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1(informal) to lie down or fall asleep because you are extremely tired When I got home he'd already flaked out on the bed.
  2. 2(North American English, informal) to begin to behave in a strange way
See the Oxford Advanced American Dictionary entry: flake out