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to rat on
[phrase form: rat]
01
to inform an authority about the wrong or illegal actions of others
02
to not fulfill a promise or agreement
Example
Where I come from, you don't rat on your friends.
John ratted on me, and I got in trouble.
He decided to rat on his coworker who had been stealing office supplies.
The student was afraid to rat on the bullies, fearing retaliation.
They ratted on the deal.
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