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Discover LudwigThe phrase "keel over" is correct and can be used in written English.
It is generally used to describe someone or something collapsing, either literally or figuratively. For example: The team keeled over after hearing the news that their project had been cancelled.
Dictionary
keeled over
verb
Past of keel over
Exact(59)
Lehman keeled over?
"I nearly keeled over," Garner said.
Dumbledore keeled over right in middle of Gryffindor turkeygriff buffet.
Imagine knowing that the last Tyrannosaurus rex keeled over on a Tuesday in June.
"In the past, you got sick and you keeled over and died," he said.
And now look: the case against two of them has keeled over in humiliating fashion.
In the rematch in May 1965, Liston keeled over in a fainting funk inside a round.
I'd wonder how long that kangaroo had left before it keeled over and then decomposed entirely.
A chap called Arthur, who had played the Baron, keeled over and died.
"In the past, you got sick and you keeled over and died,'' he said.
After nine years of Chicago-style economics, Chile's industry keeled over and died.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com