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Discover Ludwig"rotten apple" is a correct and usable phrase in written English.
It is typically used in the expression "a rotten apple spoils the barrel", which means that one bad individual can have a negative effect on the whole group. Example sentence: Just one rotten apple in the company was enough to make the entire team feel uneasy.
Dictionary
rotten apple
noun
A bad person, especially one who has a corrupting influence on others: a bad apple.
Exact(58)
A rotten apple will contaminate the environment".
It's sadly a rotten apple situation," Mr. Spencer said.
This rotten apple fell from a very lofty tree.
Doesn't every big barrel harbour the odd rotten apple?
It's like a rotten apple in a basket.
Residents marched in protest with placards that read "New York sent us a rotten apple".
He is a rotten apple and could infect every group where he goes, even Milan".
Sounds like a strategy designed to keep one rotten apple from the spoiling the barrel, followed by an attempt to rebrand the rotten apple as "extra ripe".
Still, the Rotten Apple represented the best in dissolute forms of life.
The worst taste of nail-polish remover, rotten apple, coconut, or the dreaded "baby diaper".
Similar(1)
But the rotten-apple approach won't work in non-competitive markets where the general rule is that the information consumers need is not provided.
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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