conk off

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conk off

1. slang To fall asleep. He was so tired after his long day at work that he conked off during the movie.
2. slang Of a machine, to break or completely lose functionality. Judging by all that noise coming from her car, I'm pretty sure it's about to conk off. The blender stopped working again today—it must be ready to conk off.
See also: conk, off
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

conk off

 and conk out 
1. Sl. (from years ago.) to fall asleep. I conked off about midnight. I was so tired that I nearly conked off. I was afraid I would conk out while I was driving.
2. Sl. (always conk out.) [for something] to break down; to quit running. My car conked out finally. I hope my computer doesn't conk out.
See also: conk, off
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

conk off

in. to fall asleep. I conked off about midnight.
See also: conk, off
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in periodicals archive ?
And if your flashlight conks off in the middle of the night, the SpareOne's LED can keep you going for over 24 hours in the dark.
If the phone conks off and you give it to the service centre, the people at the centre will have access to all your data," informs an official of a phone manufacturing company.