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v. un·did (-dĭd′), un·done (-dŭn′), un·do·ing (-do͞o′ĭng), un·does (-dŭz′)
1. To reverse or erase; annul: impossible to undo the suffering caused by the war.
2. To untie, disassemble, or loosen: undo a shoelace.
3. To open (a parcel, for example); unwrap.
a. To cause the ruin or downfall of; destroy.
b. To throw into confusion; unsettle.
To come open or unfastened.

un·do′er n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.undoer - a seducer who ruins a womanundoer - a seducer who ruins a woman; "she awoke in the arms of her cruel undoer"
ladies' man, lady killer, seducer - a man who takes advantage of women
2.undoer - a person who unfastens or unwraps or opensundoer - a person who unfastens or unwraps or opens; "children are talented undoers of their shoelaces"
individual, mortal, person, somebody, someone, soul - a human being; "there was too much for one person to do"
3.undoer - a person who destroys or ruins or lays waste toundoer - a person who destroys or ruins or lays waste to; "a destroyer of the environment"; "jealousy was his undoer"; "uprooters of gravestones"
annihilator - a total destroyer
bad person - a person who does harm to others
iconoclast, image breaker - a destroyer of images used in religious worship
diversionist, saboteur, wrecker - someone who commits sabotage or deliberately causes wrecks
vandal - someone who willfully destroys or defaces property
References in classic literature ?
And if you desire to know who it is lays this command upon you, that you be more firmly bound to obey it, know that I am the valorous Don Quixote of La Mancha, the undoer of wrongs and injustices; and so, God be with you, and keep in mind what you have promised and sworn under those penalties that have been already declared to you.
The farmer followed him with his eyes, and when he saw that he had cleared the wood and was no longer in sight, he turned to his boy Andres, and said, "Come here, my son, I want to pay you what I owe you, as that undoer of wrongs has commanded me.
A woman's ne'er so ruined but she can Revenge herself on her undoer, Man.