Source : WordNet®

unravel
     v 1: become or cause to become undone by separating the fibers or
          threads of; "the sweater unravelled" [syn: {unknot}, {unscramble},
           {untangle}, {unpick}] [ant: {ravel}, {ravel}]
     2: disentangle; "can you unravel the mystery?"; "unravel the
        ball or yarn" [syn: {ravel}, {ravel out}]
     3: become undone; "the sweater unraveled" [syn: {run}]
     [also: {unravelling}, {unravelled}]

unravelling
     See {unravel}