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1. To fall asleep, usually briefly or when one is not mean to. I was so tired from staying up all night that I kept nodding out throughout the day.
2. To enter a euphoric state between consciousness and unconsciousness as a result of drug use, especially heroin or opioids. We all just got our fix and nodded out in the living room. I noticed his skin turning blue after he nodded out, so I called an ambulance.
To fall asleep without intending to do so, especially as a result of taking a drug or medicine: The medicine made me so tired that I nodded out on the subway.
mod. in heroin euphoria; under the influence of heroin. (Drugs.) Max nodded out after his fix.