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The term "knee jerk" is correct and usable in written English.
It is an idiom which can be used to describe a response that is quick, automatic, and unthinking. For example, "After the news broke, the government's knee jerk reaction was to launch an investigation."
Dictionary
knee jerk
noun
Alternative spelling of knee-jerk
synonyms
Exact(6)
"Pendular" knee jerk, leg keeps swinging after knee jerk more than 4 times (4 or less is normal).
Hooray for knee jerk reactions!
OK, maybe not, it's probably a knee jerk reaction.
Today's knee jerk reactions to the headlines.
A knee jerk reaction to my anguish.
It's a knee jerk reflex in people's vocabularies.
Similar(54)
My knee jerking.
They knee-jerked to slavery, they knee-jerked towards the n-word.
I can hear those knees jerking already!
"The city has never been one to knee-jerk things.
You're, like, knee-jerk, knee-jerk, knee-jerk.
More suggestions(6)
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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