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English definition of “telltale”

telltale

noun [C]     /ˈtel.teɪl/ (US tattletale) disapproving
a person, especially a child, who secretly tells someone in authority, especially a teacher, that someone else has done something bad, often in order to cause troublePeople who reveal secrets and tell tales
(Definition of telltale noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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