tell tales
成語所屬單字tale
tell tales — 慣用語
1. To reveal someone's secrets or bad behaviour to a person in authority, often wit
1.慣用語
釋義
打小報告；告密
To reveal someone's secrets or bad behaviour to a person in authority, often with the result of getting that person into trouble.
例句
If you tell tales on your classmates, they will not want to work with you on group projects.
Vikram got into trouble for telling tales about his younger brother stealing cookies from the kitchen.