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English definition of “telltale”

telltale

adjective [before noun] uk   /ˈtel.teɪl/ us  
allowing a secret to become known: She found lipstick on his shirts - the telltale sign that he was having an affair.

telltale

noun [C] uk   /ˈtel.teɪl/ (US tattletale) disapproving us  
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 trouble
(Definition of telltale from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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