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Definition of: undo
(un·d
′) v.t. ·did, ·done, ·do·ing
1. To cause to be as if never done; reverse, annul, or cancel.
2. To loosen or untie.
3. To unfasten and open.
4. To bring to ruin; destroy.
5. Obs. To solve, as a riddle. [OE undōn]
—un·do′er noun
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