To conk out (past tense: conked out) is an informal idiom with three primary meanings depending on context:
- Mechanical or Electronic Failure: To suddenly break down, stall, or stop functioning (e.g., a car engine, appliance, or phone battery).
- Physical Exhaustion or Sleep: To abruptly fall fast asleep or collapse from extreme tiredness. Note: In the present continuous form (e.g., “is conked out”), it describes someone who is currently in a very deep, unresponsive sleep due to exhaustion (e.g., “Don’t wake him up; he’s completely conked out”).
- Fainting or Collapse: To lose consciousness or faint suddenly.
In informal speech, the phrase is occasionally shortened to just conk (e.g., “The engine almost conked on the way home”).
Regional Variations: “Conk Out” vs. “Conk Off”
- Conk Out: The standard form used across American, Canadian, and global English.
- Conk Off: A common variation in British, Australian, and Commonwealth English, used interchangeably to mean a device failing or someone going to sleep.
- Alternative Spellings: Frequently misspelled phonetically as konk out or clonk out.
Why “Conk Out” Is Hard to Replace
The idiom carries a sense of abruptness, exhaustion, and deep sleep that plain verbs like break or fall asleep lack:
- With Idiom: “I was so exhausted after the drive that I conked out on the couch at 8:00 PM.”
- Without Idiom: “I was so exhausted after the drive that I unexpectedly fell into a deep sleep on the couch at 8:00 PM.”
Origin of “Conk Out”
The phrase emerged in the early 20th century during World War I as aviator slang among military pilots and mechanics. Pilots used conk out to describe an airplane engine coughing, sputtering, and stalling mid-flight.
Linguists believe the word was an imitative sound (onomatopoeia) representing the clanking metallic noise of a failing engine, heavily influenced by 19th-century slang where a conk referred to a nose or a blow to the head. By the 1920s and 1930s, the phrase expanded beyond aviation to describe any failing machine, eventually becoming popular slang for humans passing out from fatigue.
Sentence Examples
“My refrigerator finally conked out after fifteen years, so we had to buy a new one.”
“He sat down to watch the game after a double shift and conked out within five minutes.”
“I thought my phone battery would last the night, but it conked out right when I needed GPS.”
“The heat was so oppressive during the marathon that a couple of runners nearly conked out.”
“Try not to make too much noise in the living room. The kids are completely conked out after playing in the sun all day.”