"untying" in the noun sense
1. untying, undoing, unfastening
loosening the ties that fasten something the untying is easy"
"the tying of bow ties is an art
"untying" in the verb sense
1. untie, unbrace, unlace
undo the ties of
"They untied the prisoner"
2. untie, undo, loosen
cause to become loose
"undo the shoelace"
"untie the knot"
"loosen the necktie"
Source: WordNet® (An amazing lexical database of English)
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