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Fast asleep Meaning in English

expression

ˈfæst/ /əˈsɫip
FAST uh-SLEEP
fˈɑːst/ /ɐslˈiːp
FAHST uh-SLEEP

Definition

Sleeping very deeply, not easily woken up.

Usage & Nuances

Set phrase. 'Fast' here means 'firm' or 'deep,' not 'quick.' Used mainly to describe someone who is soundly sleeping, especially children or pets. Not typically used for things other than sleep.

Example Sentences

The baby is fast asleep in her crib.

basic

He was fast asleep when the phone rang.

basic

My cat is always fast asleep in the afternoon.

basic

I tried to wake her up, but she was fast asleep.

natural

By midnight, we were both fast asleep on the couch.

natural

Nothing could wake him—he was fast asleep after that long trip.

natural