tell-truth adjective 1noun 1forms 3 adjective1 •(no longer used) Exposing the truth; revealing; illuminating.In short, Ovid's Imagination in his Metamorphoses never made more unaccountable Changes, than would appear thro' such a Tell-truth Mirrour […] — 1747 noun1 •(no longer used) An honest and truthful person.But page 58. he thinks he hath for ever undone my reputation as an Expositor, even as much as I, and thousands more, believe his Answer hath undone his reputation for a Tell-truth. — 1673 formstell-truths · more tell-truth · most tell-truth