undo [ʌnˈdu:]

以下由轻松背单词网站提供

vt.解开，松开；取消，撤销

to unfasten something that is fastened or tied

His pride will undo him some day. 他的傲慢总有一天会毁了他。
I managed secretly to undo a corner of the parcel. 我悄悄地设法解开了包裹的一角。