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TOEFL IELTS BNC: 6417 COCA: 6632
undo
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verb /ʌnˈduː/
present tense
I/you/we/theyundo
he/she/itundoes
present participleundoing
past tenseundid
past participleundone
  1. 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 lid on. 他很快地拧开了固定盖子的螺丝。

    I can't undo my belt. 我解不开皮带。

     Synonyms and related words
    To unfasten, or to come unfastened: unfasten, undo, detach...
     Synonyms and related words
    To open or unlock something, or to come open: open up, open, try...
  2. 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。

     Synonyms and related words
    To change something: change, make into, convert...
    1. a.
      [I/T] computing to give a computer an instruction to ignore the last change that you made to a document 撤消（计算机最近一次执行过的命令）
       Synonyms and related words
      To use or program a computer: access, archive, back up...
TOEFL IELTS BNC: 6417 COCA: 6632
TOEFL IELTS BNC: 6417 COCA: 6632
undo verb
⇨ undo (undo a button) ⇨ reverse (undo the damage) undo

verb

undo ♦︎ open ♦︎ untie ♦︎ unbutton ♦︎ detach ♦︎ unfasten ♦︎ unzip ♦︎ unwrapThese words all mean to open sth that is fastened, tied or wrapped, or to separate two things that are joined together. 这些词均表示打开、解开、拆开。PATTERNS AND COLLOCATIONS 句型和搭配◆to undo / open / untie / unwrap a parcel / package◆to undo / untie a knot / rope / string / ribbon / lace / shoelace◆to open / unwrap a present◆to undo / unbutton / unfasten / unzip a jacket / coat / fly◆to undo / unbutton / detach / unfasten a collar◆to undo / unfasten a belt / button / clip / strap / zip / buckle / catch / seat belt◆to undo / unbutton a blouse / shirt■ undo ʌnˈduː (undid, undone) [transitive] to open sth that is fastened, tied or wrapped 打开；解开；拆开◆I can't undo this zip－it seems to be stuck.我拉不开这个拉链，好像卡住了。◆He undid his jacket and threw it over a chair.他解开上衣，扔到椅子背上。◆I undid the package and took out the books.我打开包裹取出书来。 OPP do (sth) up ⇨ tie ■ open [transitive] to remove the lid or undo the fastening of a container, etc. in order to see or get what is inside 打开，开启（盖子、封口等）◆Shall I open another bottle?要不要我再开一瓶？◆He opened the letter and read it.他拆开信读了起来。■ untie ʌnˈtaɪ [transitive] to undo a knot in sth; to undo sth that is tied 解开⋯的结；打开◆Can you untie this knot for me?你能帮我解开这个结吗？◆He untied the rope and pushed the boat into the water.他解开缆绳，把小船推入水中。◆She untied his hands and let him go.她解开他的双手把他放了。OPP tie ⇨ tie , tie ⇨ attach ■ unbutton [transitive] to undo the buttons on a piece of clothing 解开⋯的纽扣◆He unbuttoned his shirt.他解开衬衣扣子。 OPP button ⇨ tie   see also button ⇨ button noun 2 ■ detach dɪˈtætʃ [transitive, intransitive] (rather formal) to remove sth from sth larger; to become separated from sth 拆卸；使分开；脱离◆Detach the coupon and return it as soon as possible.将赠券撕下后尽快寄回。◆One of the panels had become detached from the main structure.其中一块镶板已从主体结构上脱落。◆The skis should detach from the boot if you fall.要是你跌倒了，滑雪板应会脱离靴子。 OPP attach ⇨ attach ■ unfasten [transitive] (rather formal) to open sth that is fastened 解开；松开；打开◆Passengers are permitted to unfasten their seat belts.乘客获准解开安全带。 OPP fasten ⇨ tie   see also fastener ⇨ button noun 2 ■ unzip ˌʌnˈzɪp (-pp-) [transitive, intransitive] to undo a bag or piece of clothing by unfastening the zip; (of a bag or piece of clothing) to open with a zip 拉开⋯的拉链；（包或衣服）用拉链拉开ⓘ A zip (BrE) or zipper (NAmE) is a type of fastener that consists of two rows of metal or plastic teeth that you can pull together to close sth or pull apart to open it. * zip（英式英语）或zipper（美式英语）指拉链、拉锁◆She unzipped his jacket, as if he were a child.她拉开他的上衣拉链，仿佛他是一个孩子。◆The bag unzips at the side.这个包的拉链开在侧面。 OPP zip ⇨ tie   see also zip , zipper ⇨ button noun 2 ■ unwrap ʌnˈræp (-pp-) [transitive] to take off the paper, etc. that covers or protects sth 拆开⋯的包装◆Don't unwrap your present until your birthday.礼物要等到你生日那天才可以打开。 OPP wrap ⓘ To wrap sth (up) is to cover it completely in paper or other material, for example when you are giving it as a present. * wrap sth (up)指用纸或其他物料把东西包裹起来，如包装礼物等◆He spent the evening wrapping up the Christmas presents.他花了一晚上把圣诞礼物都包了起来。◆individually wrapped chocolates独立包装的巧克力

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