What is the meaning of untying?

noun

• Loosening the ties that fasten something.
  • usage: "the tying of bow ties is an art; the untying is easy"
  • synonyms: undoing, unfastening

verb

• Undo the ties of.
  • usage: "They untied the prisoner"
  • synonyms: untie, unbrace, unlace
• Cause to become loose.
  • usage: "undo the shoelace"; "untie the knot"; "loosen the necktie"
  • synonyms: untie, undo, loosen