rat on
Intermediate (B1) informal
To tell someone in charge (like a teacher, boss, or police) about something bad another person did — especially someone you were supposed to be loyal to.
"He ratted on his partners to the police in exchange for a lighter sentence."
Hear it in context
Chris Walley and Alex Murphy look back on The Younger Offenders - BBC
BBC · 7:34
Rat on your cage.
Interviewing a Prison Escapee ON THE RUN
Alhan FM · 25:33
Did he rat on you?
Most Watched Scenes from Season 1 | Suits
Suits Official · 41:47
and get him to rat on the other one.
Resurrection Ertugrul - Season 2 Episode 16 (English Subtitles)
TRT Drama English · 31:07
...do you want me to rat on, my husband, your son?
Millions of JS devs just got penetrated by a RAT…
Fireship · 3:14
that runs some JavaScript code to install the rat on your machine.