THESAURUS
tell the truth
acknowledge, admit, admit everything, allow, avow, awaken, break the spell, burst the bubble, come clean, concede, confess, cop a plea, correct, debunk, disabuse, disappoint, disenchant, disillude, disillusion, disillusionize, enlighten, expose, grant, let down easy, let in on, let on, open up, out with it, own, own up, plead guilty, prick the bubble, put straight, set right, set straight, show up, spill, spill it, spit it out, tell all, tell true, unblindfold, uncharm, undeceive, unspell, wake up
ROGET THESAURUS
tell the truth
Veracity
VB
speak the truth,
tell the truth, speak by the card, paint in its true colors, show oneself in one's true colors, make a clean breast, speak one's mind, not lie &c, not deceive.