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Sound asleep Meaning in English

expression

ˈsaʊnd/ /əˈsɫip
SOWND uh-SLEEP
sˈaʊnd/ /ɐslˈiːp
SOWND uh-SLEEP

Definition

Completely and deeply asleep, so you are not easily woken up.

Usage & Nuances

"Sound asleep" is an informal but standard phrase for very deep sleep, often used in descriptions or storytelling. Commonly appears after verbs like "be", "fall", or "find someone". Not used about naps or very short sleep.

Example Sentences

The baby is sound asleep in her crib.

basic

When I checked, he was sound asleep.

basic

She fell sound asleep after dinner.

basic

I tried to call his name, but he was sound asleep and didn’t hear a thing.

natural

Don’t worry, the kids are sound asleep upstairs—you can talk freely.

natural

After the long flight, I was sound asleep before my head hit the pillow.

natural