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| VERB |
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| /ʌnˈduː/ |
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| 1 | T to open , untie , or remove something so that it no longer closes, fastens, or connects another thing 打开；解开；松开；拆开 |
| He quickly undid the screws that held the cassette together. 他很快地拧开了磁带盒的螺丝。 |
| I can’ t undo my belt. 我解不开皮带。 |
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| 2 | T to have the effect of changing something back into its original , usually worse state 使恢复原状；使无效 |
| She warned that one mistake could undo all their achievements. 她警告说一个错误就可能使他们所有的成就化为乌有。 |
| | 2a | I/T to give a computer an instruction to ignore the last change you made to a document 撤消（计算机最近一次执行过的命令） | |
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