rat on
to betray someone by telling someone else about illegal or wrong activities, to report someone's bad behavior to someone

[TahlilGaran] Dictionary of Contemporary English ▲

rat on
to betray someone by telling someone else about illegal or wrong activities; to report someone's bad behavior to someone
The young boy ratted on his friend who broke the store window.

The little boy ratted on his friend at school.

[TahlilGaran] English Idioms Dictionary ▲

rat on
See: BLOW THE WHISTLE, RAT OUT.

[TahlilGaran] English Idioms Dictionary ▲

rat on someone
to betray someone by telling someone else about illegal or wrong activities; to report someone's bad behavior to someone
The young boy ratted on his friend who broke the store window.

The little boy ratted on his friend at school.

[TahlilGaran] English Idioms Dictionary ▲