| 开区间 | kāi qū jiān | open interval (in calculus) |
| 开印 | kāi yìn | to start a print run |
| 开卷 | kāi juàn | to open a book; open-book (exam) |
| 开卷有益 | kāi juàn yǒu yì | lit. opening a book is profitable (idiom); the benefits of education |
| 开原 | Kāi yuán | Kaiyuan county level city in Tieling 铁岭, Liaoning |
| 开原市 | Kāi yuán shì | Kaiyuan county level city in Tieling 铁岭, Liaoning |
| 开原县 | Kāi yuán xiàn | Kaiyuan county in Tieling 铁岭, Liaoning |
| 开口子 | kāi kǒu zi | a dike breaks; fig. to provide facilities (for evil deeds); to open the floodgates |
| 开味 | kāi wèi | whet the appetite |
| 开启 | kāi qǐ | to open |
| 开单 | kāi dān | to bill; to open a tab |
| 开国元勋 | kāi guó yuán xūn | founding figure (of a country or dynasty); founding father; fig. also used of company or school etc; ounding father; fig. also used of company, school etc |
| 开国功臣 | kāi guó gōng chén | outstanding founding minister (title given to reward loyal general or vassal of new dynasty or state) |
| 开地 | kāi dì | to clear land (for cultivation); to open up land |
| 开城市 | Kāi chéng shì | Kaesong or Gaeseong 개성시 city in southwest North Korea, close to the border with South Korea and a special economic zone for South Korean companies |
| 开埠 | kāi bù | to open up a port for trade; to open treaty ports |
| 开堂 | kāi táng | to open a law court; to set up a mourning hall |
| 开场白 | kāi chǎng bái | prologue of play; opening remarks; preamble (of speeches, articles etc) |
| 开士米 | kāi shì mǐ | cashmere |
| 开壶 | kāi hú | pot of boiling water |
| 开大油门 | kāi dà yóu mén | to open the throttle; to accelerate; to let her rip |
| 开天窗 | kāi tiān chuāng | to leave a blank to mark censored area |
| 开天避地 | kāi tiān bì dì | to open the sky and divide the earth; ref. to Pangu 盘古 in the Chinese creation myth |
| 开始以前 | kāi shǐ yǐ qián | before the beginning (of sth) |
| 开始比赛 | kāi shǐ bǐ sài | to start a match; to kick off |
| 开始营业 | kāi shǐ yíng yè | to start trading; to open for business |
| 开封地区 | Kāi fēng dì qū | Kaifeng prefecture in Henan |
| 开封市 | Kāi fēng shì | Kaifeng prefecture level city in Henan, old capital of Northern Song, former provincial capital of Henan; old name Bianliang 汴梁 |
| 开封府 | Kāi fēng fǔ | Kaifeng as the capital of Northern Song dynasty |
| 开封县 | Kāi fēng xiàn | Kaifeng county in Kaifeng, Henan |
| 开小会 | kāi xiǎo huì | to whisper and chat (instead of listening during a meeting or lecture) |
| 开小灶 | kāi xiǎo zào | lit. to turn on a private oven; to get special attention |
| 开屏 | kāi píng | (a peacock) spreads its tail |
| 开山祖师 | kāi shān zǔ shī | founding master of a monastery; founder; originator |
| 开山鼻祖 | kāi shān bí zǔ | founder |
| 开幕典礼 | kāi mù diǎn lǐ | opening ceremony |
| 开平区 | Kāi píng qū | Kaiping district of Tangshan city 唐山市, Hebei |
| 开平市 | Kāi píng shì | Kaiping county level city in Jiangmen 江门, Guangdong |
| 开店 | kāi diàn | to open shop |
| 开吊 | kāi diào | to hold memorial service; to hold a funeral |
| 开往 | kāi wǎng | to leave for; heading for |
| 开后门 | kāi hòu mén | to open the back door; fig. under the counter; to do a secret or dishonest deal; to let sth in by the back door |
| 开心果 | kāi xīn guǒ | pistachio nuts; fig. amusing person |
| 开心颜 | kāi xīn yán | to rejoice; smiling |
| 开快车 | kāi kuài chē | an express train sets off; fig. to work in haste; to rush |
| 开恩 | kāi ēn | to give a favor (used of Christian God) |
| 开怀 | kāi huái | to one's heart's content; without restraint |
| 开戒 | kāi jiè | to end abstinence; to resume (drinking) after a break; to break (a taboo) |
| 开戏 | kāi xì | to start an opera |
| 开房间 | kāi fáng jiān | to take a hotel room; to rent a room |
