sound asleep

sound asleep (not comparable)

  1. (idiomatic) Sleeping still and silently.
    • 1874, Marcus Clarke, For the Term of His Natural Life Chapter V
      When Frere had come down, an hour before, the prisoners were all snugly between their blankets. They were not so now; though, at the first clink of the bolts, they would be back again in their old positions, to all appearances sound asleep.
    Synonyms: fast asleep

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