verb (v)

• undo the ties of(verb.contact)

  Example:
  They untied the prisoner.
  

  Synonym:
  unbrace, unlace
  Antonym:
  bind, tie
  

  source: wordnet30
• cause to become loose(verb.contact)

  Example:
  Untie the knot.
  

  Synonym:
  loosen, undo
  

  source: wordnet30
• To loosen, as something interlaced or knotted; to disengage the parts of; as, to untie a knot.(verb)

  source: webster1913
• To become untied or loosed.(verb)

  source: webster1913