tell-tale sign

A tell-tale sign is an indication that something exists or has happened, especially something that is secret or not obvious. A telltale can also be an instrument that gives a visual clue about the state of something. For example, a person's muddy boots may be a tell-tale sign they cut through a person's garden. Some tell-tale signs of deception include being vague, repeating questions, speaking in fragments, and grooming behaviors.


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