noun
a person, especially a child, who reveals secrets or informs on others; informer or talebearer
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The teacher was disappointed to see one student acting as a tattletale on their classmates.
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I can't believe Sarah is such a tattletale, always telling on everyone.
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Don't be a tattletale and go running to the boss about every little thing.
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The old clock on the wall was a tattletale, ticking away the passing minutes.