打击非法投机活动 strike out at speculation; crack down on speculation
打假 crack down on fake products
打假办 Office of Cracking down on Fake Products
大检察官 principal public procurator
大减价 markdown sales
大贱卖 big offering
大奖赛 prize-giving competition
打卡机 punch machine
打开天窗说亮话 put all cards on the table; speak frankly; let's not mince matters
大开眼界 open one's eyes; broaden one's horizons; be an eye-opener
打口碟 cracked CD
大款 tycoon
大力扣杀 hammer
大龄青年 single youngsters who have exceeded the lawful marriage age (In China the age status of this group of people is around thirty in age. To be a short term, it is also called overage youth)
大路货 1.cheap goods; 2. popular goods of fine quality
大麻 marijuana, usually smoked or eaten to induce euphoria. (A British study shows the IQ of workers who tried to juggle messages and work fell by 10% - the equivalent to missing a whole night's sleep and more than double the 4% fall seen after smoking marijuana. 英国近日一项研究发现，在工作中经常发短信的人智商会降低10%，相当于一整夜没睡觉，而抽大麻后智商也只会下降4%。）
大满贯 grand slam
大排档 large stall; sidewalk snack booth
大片 big-budget movie (A slew of big-budget movies managed to lure moviegoers into theaters in the US and Canada during the Christmas holidays, despite a sluggish economy and bad weather. 尽管经济萧条、天气不好，一些大片还是在圣诞节期间把美国和加拿大的影迷们拉进了电影院。)
打破僵局 break the deadlock
打破垄断 breakup of monopoly
打破“三铁” break the Three Irons: iron armchairs(life-time posts), iron rice bowl(life-time employment) and iron wages (guaranteed pay)
大气候 state policies and principles; overall atmosphere
大人物 great man; big potato; very important person (VIP)
大撒把 totally laissez-faire