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(idiomatic) Sleeping still and silently.
A few minutes wouldn't hurt, and then he would be sound asleep.
Miss Sullivan had put out the light and gone away, thinking I was sound asleep.
Rosie was sound asleep on the bed, snoring very loudly.
She lay there, sound asleep.
The other night when I went to bed, I found Helen sound asleep with a big book clasped tightly in her arms.
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