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Meaning of “undo” - Learner’s Dictionary

undo

verb [T]     /ʌnˈduː/ ( present participle undoing, past tense undid, past participle undone)
OPEN
B2 to open something that is tied or fastened: I took off my hat and undid my coat. Can you undo this knot for me?Unfastening and opening
GET RID OF EFFECTS
B2 to get rid of the effects of something that has been done before: Some of the damage caused by pollution cannot be undone.Removing and getting rid of thingsTaking things away from someone or somewhere
(Definition of undo from the Cambridge Learner’s Dictionary © Cambridge University Press)
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Avoiding common errors with the word enough.
Avoiding common errors with the word enough.
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by Liz Walter Enough is a very common word, but it is easy to make mistakes with it. You need to be careful about its position in a sentence, and the prepositions or verb patterns that come after it. I’ll start with the position of enough in the sentence. When we use it with a noun,

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