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Discover LudwigThe phrase "like crazy" is correct and can be used in written English.
It is an informal phrase which means to do something with great enthusiasm or energy. For example, "The kids were playing like crazy in the backyard."
Dictionary
like crazy
adverb
To a great or excessive degree; with great speed, output, enthusiasm, etc.
Exact(60)
(They squeak like crazy).
Men don't like crazy.
It's, like, crazy.
"Fish use them like crazy.
They itched like crazy.
"I worked like crazy.
Work like crazy!
"We drank like crazy.
Republicans started earmarking like crazy.
This boat rolls like crazy.
"People were running like crazy.
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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