Undoing (noun)

1. The act of undoing something that has been done.
2. The action of reversing or cancelling out the effects of something.

Origin:

Middle english: from un- (expressing negation) + doing.

Examples:

1. The undoing of the damage was a slow and tedious process.
2. The undoing of the knot was frustrating for everyone involved.
3. The undoing of the mistake was essential in order to move forward.
4. The undoing of the spell was the key to freeing the captive.
5. The undoing of the crime was the top priority for the authorities.