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zonk out

B2 informal inseparable intransitive
In simple words

To fall fast asleep very quickly, usually because you are totally worn out

Meanings

1 B2 idiomatic informal

To fall into a deep sleep very suddenly, especially after great physical or mental effort

"He zonked out on the sofa within minutes of getting home from the night shift."

Grammar: inseparable
2 B2 idiomatic informal

To be made to fall asleep by a drug, medication, or alcoholic drink

"The sleeping pills zonked her out completely — she didn't wake until noon."

Grammar: separable
Usage notes

Very vivid and informal. Common in British and American English. Implies not just falling asleep but doing so heavily and completely. Also occasionally used for the effect of a sedative or sleeping pill.

Commonly used with

couch sofa bed immediately exhausted medication

Forms

Base
zonk out
I/you/we/they
3rd person
zonks out
he/she/it
Past simple
zonked out
yesterday
Past participle
zonked out
have + pp
-ing form
zonking out
continuous

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Synonyms

crash conk out pass out drop off fall asleep go out like a light

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