Giải nghĩa:
To tell someone in authority about something wrong or illegal that someone else has done, usually in order to get them in trouble.
Ví dụ:
He threatened to rat on me if I didn't give him half of my lunch every day.
Cách sử dụng
The expression "rat on" means to tell someone in authority (like the police or a teacher) that someone else has done something wrong or bad. It is usually used in a negative context where someone is betraying their friend or colleague. For example, if someone tells the police that their friend stole something, they have "ratted on" their friend. It is not a polite thing to do and can damage relationships.
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