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Discover Ludwig'knock up' is not correct and usable in written English.
It is a slang phrase which means to surprise or wake someone up. It is not appropriate in formal writing.
Dictionary
knock up
verb
To exhaust; wear out; weary; beat; tire out; to fatigue until unable to do more.
synonyms
Exact(48)
An email while the players knock up.
It took him four weeks to knock up a prototype.
We knock up a bit of fashionably late supper.
Soon Sean drifted away, perhaps to knock up other guests.
Wise chap.Centre Court seems tense as the players knock up.
Saturdays he could knock up as much as five pounds.
Similar(12)
And long indulgent lunches are a must - the chef can knock-up grilled fish plucked fresh from the ocean in the island's open-air beach restaurant.
I ask him if we can have a knock-up.
Personally it looks to me like a Victorian knock-up.
They've started the knock-up, and we should be underway again shortly.
Roger's got his tank top on for the net photo op and the knock-up.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com