n (1) 紐扣，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/襯衣/褲子紐扣;a row of～s down the front of a coat 上衣前面的一排紐扣;sew on a～縫上紐扣;do one's～s up系上紐扣;unfasten a～解開紐扣; lose a～off one's coat外衣掉了一粒扣子;open the top two～s of one's dress解開衣服最上面的兩個(gè)扣子;a～nose扁鼻子;
(2) 按鈕(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按按鈕打開無線電/發(fā)動(dòng)機(jī)器/停下電梯;The gate slid open at the press of a～.按鈕一按大門就滑開了。This～turns the light on.這按鈕能開燈。Which～turns it off? 哪個(gè)按鈕能把它關(guān)掉?
v扣紐扣((cause to) fasten with buttons)[T+n， T+n+adv(up)， I， I+adv(up)]：～(up) a coat/a shirt 系上外衣/襯衣的紐扣;Does this dress～or zip? 這女外衣是系扣的還是拉拉鎖的? The dress～s at the back.這衣服在背后系扣。The breeches～below the knees.這馬褲在膝蓋以下系扣。My jacket doesn't～(up) easily.我的夾克不容易扣。This coat～s right up to the chin.這上衣扣子一直扣到下巴處?！挤础絬nbutton;
→′buttonhole n 扣眼;′buttonhook n 紐扣鉤