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undo

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un⋅do

  [uhn-doo]
Use undo in a Sentence
–verb (used with object), -did, -done, -do⋅ing.
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:
bef. 900; ME; OE undōn; c. D ontdoen. See un- 2 , do 1

Related forms:
un⋅do⋅a⋅ble, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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un·do   (ŭn-dōō')   
v.   un·did (-dĭd'), un·done (-dŭn'), un·do·ing (-dōō'ĭng), un·does (-dŭz')

v.   tr.

  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.

    1. To cause the ruin or downfall of; destroy.

    2. To throw into confusion; unsettle.

  5. Obsolete To solve or interpret; unravel.

v.   intr.
To come open or unfastened.
un·do'er n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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 1340; the notion is of "to annul something that was done." Undoing "action of bringing to ruin" is recorded from 1398.
Online Etymology Dictionary, © 2001 Douglas Harper
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