大家好，知识小编来为大家讲解下。undo是什么意思，undo的用法很多人还不知道，现在让我们一起来看看吧！

一、undo是什么意思

1、undo 打开

2、un-, 使相反，do, 做。即把做好的解开，打开。

二、undo的用法

1、undo (v.)

2、Old English undon "to unfasten and open" (a window or door), "to unfasten by releasing from a fixed position; to cancel, discharge, abrogate, reverse what has been done, put back in a former condition; bring to ruin, destroy," from un- (2) "opposite of" + do (v.). Related: Undone; undoing.

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