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TOEFL IELTS BNC: 6417 COCA: 6632

undo

Word family
Related topics: Computers
ldoce_346_gun·do /ʌnˈduː/ ●●○ verb (past tensepst undid /-ˈdɪd/, past participlepp undone /-ˈdʌn/, third person singular3rd undoes /-ˈdʌz/) [transitiveT]  
1 FASTEN1#TIE#to open something that is tied, fastened, or wrapped 解开,打开,松开〔某物〕
 The screws can be undone by hand.
这些螺丝可以用手拧开。
 I undid the package carefully.
我小心地打开包裹。
undo your jacket/shirt/bra etc 解开你的夹克/衬衫/胸罩等
 He undid his coat.
他解开外套。
see thesaurus at open5  See picture of unzip 拉开拉链, loosen 松开〔领带〕, unbutton 解开纽扣, untie 解开〔鞋带〕
2 IMPROVEto try to remove the bad effects of something you have done 消除的坏影响
 We cannot undo the damage of a lifetime in only 30 days.
我们不能在短短的 30 天内消除影响一生的伤害。
 If a medicine is taken again too soon, it may undo all the good that has been done.
如果服用一种药物时间间隔过短,可能会抵消所有已产生的药效。
3. technical to remove the effect of your previous action on a computer 撤销〔先前的计算机指令〕
Examples from the Corpus
un·do verb
Chinese
Syllable
Corpus

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