undo Meaning in the Cambridge English Dictionary
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Meaning of “undo” in the English Dictionary

"undo" in British English

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undoverb [T]

uk   us   /ʌnˈduː/ (present participle undoing, past tense undid, past participle undone)

undo verb [T] (UNFASTEN)

B2 to ​unfasten something that is ​fastened or ​tied: Can someone ​help me to undo my ​seatbelt?
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undo verb [T] (REMOVE EFFECTS)

B2 to ​remove the good or ​badeffects of an ​action or several ​actions: I did a really ​toughaerobicsclass and then went out for ​dinner and undid (all) the good ​work! It's very ​difficult to undo the ​damage that's ​caused by ​inadequateparenting in a child's early ​years.
(Definition of undo from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"undo" in American English

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undoverb [T]

 us   /ʌnˈdu/ (present participle undoing, past tense undid  /ʌnˈdɪd/ , past participle undone  /ʌnˈdʌn/ )

undo verb [T] (UNFASTEN)

to ​unfasten something that is ​closed or ​tied: He undid the ​topbutton of his ​shirt and ​loosened his ​tie.

undo verb [T] (REMOVE EFFECTS)

to ​remove the ​effects of something that ​happenedearlier: It’s ​difficult to undo the ​damage caused by a ​father who ​abandons his ​child.
(Definition of undo from the Cambridge Academic Content Dictionary © Cambridge University Press)
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