verb
to inform on someone or reveal their wrongdoing
preposition
used to indicate that someone has informed on someone else or revealed their wrongdoing
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I cannot tell on my coworker for making a mistake without concrete evidence.
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Don't worry, I won't tell on you for sneaking out of the party early.
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If you tell on me to the teacher, I'll never forgive you!
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Sometimes our conscience tells on us when we try to hide our mistakes.