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undo

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undo/ˌʌnˈduː/verb
undoesundid/-ˈdɪd//ˌʌnˈdɪd/undone/-ˈdʌn//ˌʌnˈdʌn/undoing
undo
/ˌʌnˈduː/
verb
undoesundid/-ˈdɪd//ˌʌnˈdɪd/undone/-ˈdʌn//ˌʌnˈdʌn/undoing
Learner's definition of UNDO  
[+ object]
: to open or release (something): to unfasten or loosen (something)
: to change or stop the effect of (something)
formal : to cause the failure of (someone or something)
— see also undone
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