knock one out
B2 informal separable transitive
In simple words
To make something really quickly, or to completely amaze someone.
Meanings
1 B2
idiomatic
informal
To produce or complete something quickly and with apparent ease.
"The designer knocked one out in an afternoon — the client was thrilled with the result."
Grammar: separable
2 B2
idiomatic
informal
To deeply impress or astonish someone.
"Her vocal performance on that last track really knocked one out — no one expected it."
Grammar: separable
Usage notes
Informal variant of 'knock out.' Often used colloquially to mean producing something quickly ('I'll knock one out by lunch') or impressing someone ('That performance knocked one out'). Also used informally to mean to masturbate (vulgar slang — be careful with context). Most common in casual spoken English.
Commonly used with
quickly by lunch overnight performance speech
Forms
Base
knock one out
I/you/we/they
3rd person
knocks one out
he/she/it
Past simple
knocked one out
yesterday
Past participle
knocked one out
have + pp
-ing form
knocking one out
continuous
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Synonyms
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