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fast asleep

This page is about the collocation fast asleep

collocation pattern: adverb + adjective

Meaning

sleeping deeply, or in a deep sleep

For example

  • The kids are fast asleep, so they won't wake up.

  • Are you sure they're fast asleep, or are they just pretending?

Note:
Also "sound asleep"

Quick Quiz

If you're fast asleep, you

a. won't wake up easily

b. went to sleep quickly

c. are breathing quickly

Contributor: Matt Errey