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Noun: zzz
Usage: informal
  1. A representation of the sound of snoring or sleeping, often used in comics or text messages
    "The cartoon character had 'zzz' floating above their head"
Interjection: zzz
Usage: informal
  1. An expression of boredom or sleepiness
    "The lecture was so dull, I felt like saying 'zzz'"

Encyclopedia: Zzz