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From The Collaborative International Dictionary of English v.0.48:
Unriddle \Un*rid"dle\, v. t. & i. [1st pref. un- + riddle.] To read the riddle of; to solve or explain; as, to unriddle an enigma or a mystery. --Macaulay. [1913 Webster] And where you can't unriddle, learn to trust. --Parnell. [1913 Webster]