n (1) 纽扣，扣子(small usu round or flat thing sewn onto a garment as a fastener or as an ornament)[C]：a coat/shirt/trouser～上衣/衬衣/裤子纽扣;a row of～s down the front of a coat 上衣前面的一排纽扣;sew on a～缝上纽扣;do one's～s up系上纽扣;unfasten a～解开纽扣; lose a～off one's coat外衣掉了一粒扣子;open the top two～s of one's dress解开衣服最上面的两个扣子;a～nose扁鼻子;

(2) 按钮(button-like knob pressed to control a machine， an apparatus， etc)[C]：press/push a～to turn on the radio/to start a machine/to stop a lift按按钮打开无线电/发动机器/停下电梯;The gate slid open at the press of a～.按钮一按大门就滑开了。This～turns the light on.这按钮能开灯。Which～turns it off? 哪个按钮能把它关掉?

v扣纽扣((cause to) fasten with buttons)[T+n， T+n+adv(up)， I， I+adv(up)]：～(up) a coat/a shirt 系上外衣/衬衣的纽扣;Does this dress～or zip? 这女外衣是系扣的还是拉拉锁的? The dress～s at the back.这衣服在背后系扣。The breeches～below the knees.这马裤在膝盖以下系扣。My jacket doesn't～(up) easily.我的夹克不容易扣。This coat～s right up to the chin.这上衣扣子一直扣到下巴处。〖反〗unbutton;

→′buttonhole n 扣眼;′buttonhook n 纽扣钩