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Related topics: Computersun‧do
past tense undid
past participle undone
third person singular undoes
[transitive]
past tense undid past participle undone third person singular undoes [transitive]1 to open something that is tied, fastened or wrapped : 
The screws can be undone by hand.I undid the package carefully.
The screws can be undone by hand.I undid the package carefully.2 to try to remove the bad effects of something you have done : If a medicine is taken again too soon, it may undo all the good that has been done.
If a medicine is taken again too soon, it may undo all the good that has been done.3TD technical to remove the effect of your previous action on a computer
