verb (v)

• make intelligible(verb.change)

  Example:
  Can you unscramble the message?.
  

  Antonym:
  scramble
  

  source: wordnet30
• become or cause to become undone by separating the fibers or threads of(verb.contact)

  Synonym:
  unknot, unpick, unravel, untangle
  Antonym:
  knot, ravel, tangle
  

  source: wordnet30