[1] : WordNet (r) 2.0

untying
     see untie
see also:
untie 

[2] : WordNet (r) 2.0

untie
     v 1: undo the ties of; "they untied the prisoner" syn: unbrace,
           unlace ant: tie
     2: cause to become loose; "undo the shoelace"; "untie the
        knot"; "loosen the necktie" syn: undo, loosen
     also: untying
see also:
unbrace unlace tie undo loosen untying 

[3] : WordNet (r) 2.0

untying
     n : loosening the ties that fasten something; "the tying of bow
         ties is an art; the untying is easy" syn: undoing, unfastening
see also:
undoing unfastening 

Untying >> U Words
Untying, definition of term: Untying
untying_pag1.html