rat on
中级 (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."
在语境中听
Millions of JS devs just got penetrated by a RAT…
Fireship · 3:16
install the RAT on your machine.
Stanford Neuroscientist: Can’t Remember Your Dreams? Your Brain May Be Warning You!
The Diary Of A CEO · 24:39
If you stick the rat on the wheel and it's