1. 双的，双重的　 consisting of two similar or combined parts
2. 供两人用的，双人的　 made for two people
3. 两面派的，虚伪的　 deceiving; seeming to be one thing while actually being another

　They bought a double bed.　他们买了一张双人床。
　We don't like the man who bears a double face.　我们不喜欢不诚实的人。
　The man will be given double pay if he wants to work on Sundays.　如果他想星期天工作，那他就会得双倍的工资。
　The total output is double that of last year.　总产量是去年的两倍。
　It is more than double the 1976 figure.　这个数字是1976年的两倍多。
　20 is double 10. 　20是10的两倍。
　His share is double.　他的份额是双份的。

U 两倍，双份 sth that is twice the size, quantity value, or strength of sth else

　double　作名词的基本意思是“两倍，双份”，引申可作“极相似的（人）”“替身演员”“赛马中的复式下注”解；也可指网球等的“双打”，此时一般用复数形式；还可指在同类比赛中“两次获奖”，此时一般用单数形式，且其前有定冠词。

　Ten is the double of five.　十是五的两倍。
　Two Scotches, please—and make those doubles.　请来两杯苏格兰威士忌——都要双份的。
　He is my double.　他酷似我。
　Here is the double of your lost glove.　这是一副与你遗失的手套相同的一副。
　Movie actors sometimes employ their doubles.　电影演员有时要找替身。
　He won the daily double.　他赢了那天的双重下注赛。
　They are a Championship of the mixed doubles.　他们是混合双打的冠军。
　She's going for the double this year, the Olympics and the World Championship.　今年她要争取奥运和世界杯的双料冠军。

1. vt. & vi.把…对折，折叠　 fold in half
2. vt. & vi.是…的两倍，（使）加倍　 make or become twice as great or as many
3. vt. & vi.兼任，兼作　 have a second use, job or purpose
4. vi.折回，掉头　 turn back

　～ the amount　使数额加一倍
　～ a slice of bread　把一片面包对折
　～ along　弯得低低的，全副武装
　～ back　把…对折，循原路折回
　～ the map back　将地图对折
　～ in　向内折叠
　～ over　折起，（使）弯下身子
　～ sb over　（使）某人弯下身
　～ over the edge　把边折起来
　～ up　折起，弯〔曲〕，与别人同住一室
　～ as　兼作，兼演
　～ as an auditorium　兼作礼堂
　～ as secretary and receptionist　兼作秘书和招待员
　～ for　代替（某人）
　～ in brass　同时做两份工作
　～ in number　在数量上翻一番
　～ in value　在价值上翻一番
　～ on〔upon〕　迂回，突然袭击
　～ on one's steps　走回头路
　～ upon the enemy　突然袭击敌人

　As a result, daily output has doubled.　结果日产量翻了一番。
　Tea and fruit crops doubled.　茶叶和水果的收成增加一倍。
　The efficiency of the furnace more than doubled.　锅炉的效率提高了一倍多。
　They doubled along, carrying all their equipment.　他们背着全部器材，身子弯得低低的。
　He suddenly doubled and ran in the opposite direction.　他突然回转身来，朝相反方向跑去。
　The fox doubled on its tracts.　狐狸突然转身循着原路急逃。
　He doubles our wages on Sundays.　星期天他给我们加倍的工资。
　The baby doubled its weight in a year.　那婴儿一年中体重增加了一倍。
　This will enable us to double the output of our TV-sets.　这将使我们把电视机的产量增加一倍。
　He was so sure his horse would win that he doubled his bet.　他肯定他的马能赢，所以下了双倍的赌注。
　This has doubled the productivity of the mill.　这使工厂的劳动生产率提高了一倍。
　She doubled the parts of mother and daughter.　她同时担任母亲和女儿两个角色。
　He doubled the parts of king and slave in that play.　在那个剧里，他兼演国王和奴隶。
　He is doubling the parts of a preacher and a teacher.　他扮演牧师和教师两个角色。
　Let me double the shawl and put it round you.　让我把这披巾折起来围在你身上。
　She doubled the sheet of the paper and put it away.　她把这张纸折起来放到一边。
　In experimental plots the yield has been doubled.　在试验田里，产量已提高了一倍。

 ♣ double as　(v.+prep.)
　兼扮（某个）角色　play the part of
　She doubled as the maid and the secretary in the play.　她在这个剧里兼饰女佣和秘书。
　This chair doubles as a bed.　这张椅子兼作床。
 ♣ double back　(v.+adv.)
1. 沿原路返回 return along the same path
　She started running towards the street but suddenly doubled back to the house.　她出发向大街跑去，但是突然折回头向屋子跑去。
2. 将（某物）折起来 fold (sth), as in half
　He told me to double back the sheet of paper and tear it in half.　他告诉我把纸对折然后撕成两半。
　We doubled the top of the sheet back over the covers, for comfortable sleep.　我们把单子边翻到毯子上面来，以便睡得舒服些。
 ♣ double for　(v.+prep.)
　代替（某人）　act as a replacement for (sb)
　I'll double for you in the committee meeting.　我将代替你去参加委员会的会议。
 ♣ double in brass　(v.+prep.+n.)
1. 〈美〉能兼奏另一种乐器（如铜管乐器或其他管乐器） be able to play another musical instrument
　Can any of the players double in brass?　乐队中有人能兼奏铜管乐器吗?
2. 〈美口〉能做专业外的其他事情 be able to do sth else as well as the work in which one specializes
　The young man can double in brass by writing as well as printing the magazine.　这个年轻人既能刊印杂志又能写。
　The boss didn't like him to double in brass.　老板不喜欢他同时干两份工作。
 ♣ double over　(v.+adv.)
1. 将（某物）叠起来 fold (sth), as in half
　Double over the map so that we can read it more easily.　把地图对折起来，这样看起来更容易。
　Double over the edge before sewing.　在缝纫时先把边折过来。
2. （使）弯腰 (cause to) bend
　Rose doubled over when Facer walked in wearing his funny clothes.　当费塞穿着滑稽的服装走进来时，露丝笑得直不起腰来。
　On her way back from the fields, she suddenly doubled over with labour pains.　从地里回来时，她突然一阵阵痛，不由得蹲了下去。
　The blow doubled the fighter over.　那一击把这个拳击手打得弯下了腰。
 ♣ double up　(v.+adv.)
1. 把（某物）叠起来 fold (sth), as in half
　The carpet is too thick to double up.　地毯太厚，折不起来。
　We shall have to double up the sheets to get them in the drawer.　我们得把这些被单折叠起来才能放进抽屉里。
　He doubled up his fists in anger.　他愤怒地握紧拳头。
2. （使）弯腰 (cause to) bend
　They all doubled up when I told my joke.　当我讲笑话时，他们都笑得直不起身子来。
　He doubled up with the pain of the blow.　这一下打得他痛得蹲了下去。
　He doubled up his legs and kicked out.　他腿弯起又伸开。
　The sad news doubled him up.　噩耗使他悲痛欲绝。
3. 〈非正〉挤在一起 increase one's numbers
　We haven't any single rooms left. Do you mind doubling up?　我们已没有单人房间了，您和别人挤挤行吗?
　Do you mind doubling up with Gara tonight?　你今晚和加拉挤在一起睡好吗?

 ♣ double over, double up
　这组短语都可表示“折叠”“弯腰”的意思，二者有时可以互相代替。但一般说来，后者的幅度要大一些，胸部和膝盖几乎碰在一起。

　［同义词］ adj. paired, twice, twin
　［反义词］ adj. single
　［词源］古法语<拉丁语duplus（两倍）