Definition of telltales:
(n) :
An indicator, such as a warning light, that serves to warn of a hazard or problem.
(n) :
(figuratively) Something that serves to reveal something else.
(adj) :
Revealing something, especially something not intended to be known.
(n) :
One who divulges private information with intent to hurt others.
(n) :
A story or fable that has a moral or message.
(n) :
(nautical) A length of yarn or ribbon attached to a sail or shroud etc to indicate the direction of the flow of the air relative to the boat.