telltale

Your husband is at hand; I heare his Trumpet, / We are not tell-tales, Madam; feare you not.

Try to teach your child that there's a time to intervene and a time to mind your own business. Nobody loves a telltale.

A railroad company, which has properly erected a “telltale,” or signal board, to give warning of the approach of a train to a bridge and which lights the place at night by an electric light, is not responsible for injury caused at night by the “telltale” to a brakeman who had been passing under it at regular intervals for five weeks, though when injured he was standing upon a new car higher than those before used, and though he ad received no warning from the company as to the danger of standing upon such a car while passing under the "telltale".

The telltale was the lipstick on his shirt collar.

The sailmakers mistake can be an excellent way to lose a race as the telltale signals were disturbed and confusing.

"Metamorphoses . . ." is the title of a book of telltales (or serialised fables) written by Lucius Apuleius, a neo-platonist priest in the second century A.D.