unravel

(verb) become or cause to become undone by separating the fibers or threads of. Synonyms: unknot, unscramble, untangle, unpick. Examples: "Unravel the thread."

(verb) disentangle. Synonyms: ravel, ravel out. Examples: "Can you unravel the mystery?."

(verb) become undone. Synonyms: run. Examples: "The sweater unraveled."