conk out phrasal verb informal (see also conk)

1. if a machine or car conks out, it suddenly stops working:
Our car conked out on the way home.

2. if someone conks out, they fall asleep because they are very tired:
I got home from work and I just conked out on the sofa.

[TahlilGaran] Dictionary of Contemporary English ▲

conk out
1.
to stop working or fail suddenly.
My radio conked out again, so I couldn't hear the weather reports.

Usage notes: usually said about a machine or engine
2.
to go to sleep very quickly.
I was so tired, I conked out on the couch and never even made it into bed.

[TahlilGaran] English Idioms Dictionary ▲

conk out
to fall asleep quickly with great fatigue
As soon as we returned from the hike I conked out in front of the TV.

[TahlilGaran] English Idioms Dictionary ▲

conk out
v. phr., slang, informal To fall asleep suddenly with great fatigue or after having drunk too much.
We conked out right after the guests had left.

[TahlilGaran] English Idioms Dictionary ▲