"undoing" in the noun sense
1. undoing
an act that makes a previous act of no effect (as if not done)
2. untying, undoing, unfastening
loosening the ties that fasten something the untying is easy"
"the tying of bow ties is an art
"undoing" in the verb sense
1. undo
cancel, annul, or reverse an action or its effect
"I wish I could undo my actions"
2. unmake, undo
deprive of certain characteristics
3. undo
cause the ruin or downfall of
"A single mistake undid the President and he had to resign"
4. untie, undo, loosen
cause to become loose
"undo the shoelace"
"untie the knot"
"loosen the necktie"
5. unwrap, undo
remove the outer cover or wrapping of
"Let's unwrap the gifts!"
"undo the parcel"
Source: WordNet® (An amazing lexical database of English)
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