Etymology
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undo (v.)

Old English undon "to unfasten and open" (a window or door), "to unfasten by releasing from a fixed position; to cancel, discharge, abrogate, reverse what has been done, put back in a former condition; bring to ruin, destroy," from un- (2) "opposite of" + do (v.). Related: Undone; undoing.

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Definitions of undo

undo (v.)
cancel, annul, or reverse an action or its effect;
I wish I could undo my actions
undo (v.)
deprive of certain characteristics;
Synonyms: unmake
undo (v.)
cause the ruin or downfall of;
A single mistake undid the President and he had to resign
undo (v.)
cause to become loose;
undo the shoelace
Synonyms: untie / loosen
undo (v.)
remove the outer cover or wrapping of;
undo the parcel
Synonyms: unwrap
From wordnet.princeton.edu