• WordNet 3.6
    • n undoer a person who destroys or ruins or lays waste to "a destroyer of the environment","jealousy was his undoer","uprooters of gravestones"
    • n undoer a person who unfastens or unwraps or opens "children are talented undoers of their shoelaces"
    • n undoer a seducer who ruins a woman "she awoke in the arms of her cruel undoer"
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Webster's Revised Unabridged Dictionary
    • n Undoer One who undoes anything; especially, one who ruins another.
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Century Dictionary and Cyclopedia
    • n undoer One who undoes, in any sense; one who reverses what has been done; one who ruins.
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In literature:

Greed of these pebbles, and not I, has been your undoer.
"The Dynamiter More New Arabian Nights" by Robert Louis Stevenson
An old-time Irish rage suddenly welled up in his bosom as he contemplated this jaunty, sophisticated undoer of his daughter's virtue.
"The Financier" by Theodore Dreiser
In the next apartment tranquilly slept the disturber, the trespasser in the fields of memory, the undoer of a long-wrought love.
"Nedra" by George Barr McCutcheon
Essex was his own undoer.
"Sir Walter Ralegh" by William Stebbing
As elsewhere stated in these pages, the pale face has been the great undoer of the red man.
"Trail Tales" by James David Gillilan
Greed of these pebbles, and not I, has been your undoer.
"The Works of Robert Louis Stevenson - Swanston Edition Vol. 5 (of 25)" by Robert Louis Stevenson