sound asleep
Sleeping still and silently.
Meaning adapted from Wiktionary, available under CC BY-SA 4.0.
“The baby is sound asleep in the crib.”
“I tried to wake him for dinner, but he was sound asleep after his long flight.”
“Despite the thunder shaking the windows, the exhausted traveler remained sound asleep throughout the entire night.”
- 01
asleep at the switch
Neglectful of an important task, responsibility, or opportunity.
- 02
dead asleep
Sleeping in a deep sleep
- 03
fall asleep
To be affected by paresthesia; to go numb.
- 04
fast asleep
Sleeping, in a deep sleep.
- 05
I can't hear you over the sound of
Said to dismiss what the interlocutor is saying.
- 06
like the sound of one's own voice
To talk a lot.
- 07
safe and sound
Having come to no harm, especially after being exposed to danger.
- 08
sounds like a plan
Used to indicate agreement with a proposed suggestion.
Last updated August 10, 2026