Bedeutung von "undo" - als Fremdsprache

undo

verb [ T ] uk us /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?
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.

(Definition von "undo" von Cambridge Learner's Dictionary © Cambridge University Press)