Telltale
/tˈɛˌlteɪl/
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Definition
(noun) One who divulges private information with intent to hurt others.
Sentence Examples
Nested dolls are a telltale Russian export.
The school telltale reported Tom to the principal for smoking behind the gym.
CEFR Practice Quiz
His red face was a ____ sign that he was feeling very embarrassed about the mistake he had just made today.