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.
I wish I could undo my actions
A single mistake undid the President and he had to resign
undo the shoelace
undo the parcel
undistinguishable
undistinguished
undisturbed
undivided
undivulged
undo
undocumented
undomesticated
undone
undoubtable
undoubted
