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"rat on" is a correct phrase and is commonly used in spoken and written English.
It means to betray or inform on someone, usually to authorities or a higher power. Example: "I can't believe she ratted on her own brother to the police."
Dictionary
rat on
verb
To tattle, squeal
synonyms
Exact(54)
If the parents want to disclose the accounts, "they have to rat on one of their kids," he said.
In one rhyme, Kamare and Isuku go scurrying up a child, one rat on each side.
Who wants to hang around with someone who might one day rat on them?
It's sort of all they've got, so of course no one is going to rat on its stars," said Macombs.
Vietnamese rat on the Koreans".
Think lab rat on Ritalin.
Similar(6)
Some of those complaints come from aboard the trains, one cellphone user ratting on another.
This is the story of 500 rats on the West Side Highway and one who ventured east.
"Everybody rats on everybody," he said.
Would like crack at rats on Rikers Island.
Donald Trump encountered few rats on his lawn in Jamaica Estates.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com