A person who destroys or ruins or lays waste to.
A person who unfastens or unwraps or opens.
1Essex was his own undoer.
2In the next apartment tranquilly slept the disturber, the trespasser in the fields of memory, the undoer of a long-wrought love.
3An old-time Irish rage suddenly welled up in his bosom as he contemplated this jaunty, sophisticated undoer of his daughter's virtue.
4We shall feel the fire of the divine charity: we shall be co-workers with His grace, and not undoers or spoilers of it.
5"Now, then, the name of our undoer?"