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telltale

/ˈtɛlteɪl/ noun

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about telltale at Wordnik → Where our words come from →

  1. Someone who gossips indiscreetly.

adjective

  1. Disclosing unintentionally something concealed.
    a telling smile

Origin

From tell + tale, perhaps dissimilated from earlier taleteller, from Middle English tale tellere (literally “tale teller”).

From Wiktionary, via Kaikki.org (CC BY-SA)