Undo-abler

undo

[uhn-doo]
verb (used with object), undid, undone, undoing.
1.
to reverse the doing of; cause to be as if never done: Murder once done can never be undone.
2.
to do away with; erase; efface: to undo the havoc done by the storm.
3.
to bring to ruin or disaster; destroy: In the end his lies undid him.
4.
to unfasten by releasing: to undo a gate; to undo a button.
5.
to untie or loose (a knot, rope, etc.).
6.
to open (a package, wrapping, etc.).
7.
Archaic. to explain; interpret.

Origin:
before 900; Middle English; Old English undōn; cognate with Dutch ontdoen. See un-2, do1

undoable, adjective

undo, undue.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
undo (ʌnˈduː)
 
vb , -does, -doing, -did, -done
1.  (also intr) to untie, unwrap, or open or become untied, unwrapped, etc
2.  to reverse the effects of
3.  to cause the downfall of
4.  obsolete to explain or solve
 
un'doer
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

undo
O.E. undon "to unfasten and open" (a window or door), "to unfasten by releasing from a fixed position," from un- (2) + do. Undone "not accomplished" is recorded from c.1300; sense of "destroyed" is recorded from mid-14c.; the notion is of "to annul something
that was done." Undoing "action of bringing to ruin" is recorded from late 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
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