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a small round piece of metal, plastic, etc. that is sewn onto a piece of clothing and used for fastening two parts together 纽扣；扣子 
- (British English)
to do up/undo your buttons 系上／解开扣子 - (North American English)
to button/unbutton your buttons 系上／解开扣子 to sew on a button 缝上扣子 shirt buttons 衬衫的纽扣 a row of gilt buttons 一排镀金纽扣 One of the buttons on his jacket was missing. 他夹克上的一颗纽扣不见了。
Extra ExamplesTopics Clothes and Fashiona2My coat has lost a button. 我的外套掉了一颗扣子。 The top button of his shirt was undone. 他衬衫最上面的纽扣开了。 There was a button missing from his shirt. 他衬衣上有一枚钮扣不见了。 His fingers fumbled to do up/button the small buttons on his shirt. 他的手指笨拙地扣上衬衫上的小纽扣。 I need to sew this button back on. 我得把这颗扣子再缝上去。
Oxford Collocations Dictionaryadjective- bottom
- top
- coat
- …
- button
- do up
- fasten
- …
- be missing
- come off
- (British English)
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a small part of a machine that you press to make it work （机器的）按钮 the start/stop/pause button 开始/停止/暂停按钮 Adam pressed a button and waited for the lift. 亚当按了一个按钮，然后等着乘坐电梯。 Choose ‘printer’ from the menu and click with the right mouse button. 从菜单上选取 “打印机”，然后点击鼠标右键。 She pushed a button on the control panel. 她按下了控制面板上的一个按钮。 I hit the play button on the remote. 我按了遥控器上的播放键。 The windows slide down at the touch of a button. 按一下开关，窗玻璃便降下来。 With a push of a button, I can print out everything I need. 只要按一下按钮，我就能打印出我需要的一切。
Extra ExamplesTopics Engineeringa2She hit the alarm button as fast as she could. 她以最快的速度按了警报器。 The remote control allows you to change channel at the touch of a button. 遥控器让你一按键即可变换频道。
Oxford Collocations Dictionaryadjective- on
- start
- off
- …
- click
- depress
- hit
- …
- at the touch of a button
- have your finger on
- keep your finger on
- …
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a small area on a computer screen that you click on to make it do something （电脑屏幕上的）按键 Click on the back button to go back to the previous screen. 点击返回键，回到上一页。 Click the ‘Finish’ button in the top right-hand corner of the screen. 单击屏幕右上角的“完成”按钮。 I hit the ‘Reply’ button in the mail toolbar. 我点击了邮件工具栏上的“回复”按钮。
Oxford Collocations Dictionaryadjective- on
- start
- off
- …
- click
- depress
- hit
- …
- at the touch of a button
- have your finger on
- keep your finger on
- …
- (especially North American English)
a badge, especially one with a message printed on it （尤指印有信息的）徽章 
He wore a button saying ‘Life begins at 40!’ 他戴着一颗纽扣，上面写着“生命从40岁开始！
Extra ExamplesShe wore a ‘Vote Yes’ lapel button. 她在翻领上别了一枚“投赞成票”的徽章。 The candidates all distributed campaign buttons and bumper stickers. 所有的候选人都在分发竞选徽章和保险杠贴纸。 They all wore buttons saying ‘Stop the war’. 他们全都戴着写有“停止战争”字样的徽章。 He carries around an old backpack with peace buttons on it. 他走到哪里都背着那个别着和平徽章的旧背包。
Oxford Collocations Dictionaryadjective- lapel
- campaign
- peace
- …
- wear
Word OriginMiddle English: from Old French bouton, of Germanic origin and related to the verb butt.
Idioms
(as) bright as a button
- (British English, informal)
intelligent and quick to understand 机灵的；聪颖的 More Like This Similes in idiomsSimiles in idioms- (as) bald as a coot
- (as) blind as a bat
- (as) bright as a button
- (as) bold as brass
- as busy as a bee
- as clean as a whistle
- (as) dead as a/the dodo
- (as) deaf as a post
- (as) dull as ditchwater
- (as) fit as a fiddle
- as flat as a pancake
- (as) good as gold
- (as) mad as a hatter/a March hare
- (as) miserable/ugly as sin
- as old as the hills
- (as) pleased/proud as Punch
- as pretty as a picture
- (as) regular as clockwork
- (as) quick as a flash
- (as) safe as houses
- (as) sound as a bell
- (as) steady as a rock
- (as) thick as two short planks
- (as) tough as old boots
on the button (informal, especially North American English)
push all the (right) buttons
(also press all the (right) buttons especially in British English)
- (informal)
to do exactly the right things to please somebody 做得面面俱到以讨好人 a new satirical comedy show that pushes all the right buttons 一出新的极尽搞笑之能事的讽刺喜剧
push somebody’s buttons
(also press somebody’s buttons especially in British English)