tell tales

If someone, usually a child, tells tales, they tell someone such as a teacher about something bad that someone else has done.

(通常指小孩)告状，揭短

Your classmates won't trust you if you're always telling tales, Alvin.

阿尔文，如果你老是打小报告，你的同学会不信任你的。

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I hesitated, not wanting to tell tales about my colleague.

我犹豫了，不想说同事的坏话。