One who divulges private information with intent to hurt others. / (chiefly US, slang) Tattletale; squealer. / An indicator, such as a warning light, that serves to warn of a hazard or problem.

Revealing something, especially something not intended to be known.

plural of telltale

(nautical) A compass installed in the cabin so that the captain or other officer may check the course of a ship without going to the deck; often upturned and suspended from the ceiling.

plural of telltale compass

(childish) A telltale; one who tattles.

plural of telltale tit