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telltale

[tel-teyl]
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noun
  1. a person who heedlessly or maliciously reveals private or confidential matters; tattler; talebearer.
  2. a thing serving to reveal or disclose something.
  3. any of various indicating or registering devices, as a time clock.
  4. Music. a gauge on an organ for indicating the air pressure.
  5. an indicator showing the position of a ship's rudder.
  6. a row of strips hung over a track to warn train crew members on freight trains that a low bridge, tunnel, or the like is approaching.
  7. Yachting. (on a sailboat) a feather, string, or similar device, often attached to the port and starboard shrouds and to the backstay, to indicate the relative direction of the wind.
  8. Squash. a narrow piece of metal across the front wall of a court, parallel to and extending 17 inches (43.2 cm) above the base: a ball striking this is an out.
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adjective
  1. that reveals or betrays what is not intended to be known: a telltale blush.
  2. giving notice or warning of something, as a mechanical device.
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Origin of telltale

First recorded in 1540–50; tell1 + tale
Related formstell·tale·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for tell tales

telltale

noun
  1. a person who tells tales about others
    1. an outward indication of something concealed
    2. (as modifier)a telltale paw mark
  3. any of various indicators or recording devices used to monitor a process, machine, etc
  4. nautical
    1. another word for dogvane
    2. one of a pair of light vanes mounted on the main shrouds of a sailing boat to indicate the apparent direction of the wind
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tell tales

telltale

1540s (n.), 1590s (adj.), from tell + tale, in phrase to tell a tale "relate a false or exaggerated story" (late 13c.).

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Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with tell tales

tell tales

Divulge secrets, as in Don't trust him; he's apt to tell tales. This expression was first recorded about 1350. A variant, tell tales out of school, first recorded in 1530, presumably alluded to schoolchildren gossiping but was soon broadened to revealing secret or private information. Both may be obsolescent.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.