UNRIDDLE
Etymology
Verb
unriddle (third-person singular simple present unriddles, present participle unriddling, simple past and past participle unriddled)
(transitive) To figure out the answer to (a riddle).
(transitive, by extension) To solve (a perplexing problem).
Source: Wiktionary
Un*rid"dle, v. t. & i. Etym: [1st pref. un- + riddle.]
Definition: To read the riddle of; to solve or explain; as, to unriddle an
enigma or a mystery. Macaulay.
And where you can't unriddle, learn to trust. Parnell.
Source: Webster’s Unabridged Dictionary 1913 Edition