| 一家子 | yī jiā zi | the whole family |
| 一审 | yī shěn | first instance (law) |
| 一寸光阴一寸金 | yī cùn guāng yīn yī cùn jīn | An interval of time is worth an ounce of gold (common saying); free time is to be treasured |
一寸光阴一寸金，
寸金难买寸光阴 | yī cùn guāng yīn yī cùn jīn ,
cùn jīn nán mǎi cùn guāng yīn | An interval of time is worth an ounce of gold, money can't buy you time (common saying); Time is precious and must be treasured. |
| 一对 | yī duì | couple; pair |
| 一对一斗牛 | yī duì yī dòu niú | one-on-one basketball game |
| 一对儿 | yī duìr | a pair; a couple |
| 一小部分 | yī xiǎo bù fèn | a small part; a small section |
| 一小阵儿 | yī xiǎo zhènr | very brief period of time |
| 一局 | yī jú | inning |
| 一层 | yī céng | layer |
| 一巴掌 | yī bā zhǎng | a slap; a spank |
| 一席之地 | yī xí zhī dì | a place for oneself; niche |
| 一带而过 | yī dài ér guò | to skate around; to skip over; to skimp |
| 一年半 | yī nián bàn | a year and a half |
| 一年多 | yī nián duō | more than a year |
| 一年期 | yī nián qī | one year period (in a contract or budget) |
| 一年生 | yī nián shēng | annual (botany) |
一年被蛇咬十年怕
井绳 | yī nián bèi shé yǎo shí nián pà jǐng shéng | bitten by a snake in one year, fears the well rope for ten years (idiom); once bitten twice shy |
| 一厢情愿 | yī xiāng qíng yuàn | one's own wishful thinking |
| 一弹指顷 | yī tán zhǐ qǐng | a snap of the fingers (idiom); in a flash; in the twinkling of an eye |
| 一径 | yī jìng | directly; straightaway; straight |
| 一念之差 | yī niàn zhī chā | momentary slip; false step; ill-considered action |
| 一愁莫展 | yī chóu mò zhǎn | nothing one can do about it |
| 一意 | yī yì | focus; with complete devotion; stubbornly |
| 一房一厅 | yī fáng yī tīng | one bedroom and one living room |
一手交钱，
一手交货 | yī shǒu jiāo qián ,
yī shǒu jiāo huò | lit. one hand exchanges the cash, the other the goods (common saying); to pay for what you want in cash; fig. simple and direct transaction |
| 一打 | yī dá | dozen |
| 一把死拿 | yī bǎ sǐ ná | stubborn; inflexible |
| 一把钥匙开一把锁 | yī bǎ yào shi kāi yī bǎ suǒ | one key opens one lock.; There is a different solution for each problem (idiom) |
| 一折两段 | yī zhé liǎng duàn | to split sth into two (idiom) |
| 一拍两散 | yī pāi liǎng sàn | lit. on the beat, move apart; fig. break-up (of marriage or business partners); separation |
| 一拍即合 | yī pāi jí hé | lit. on the beat, together now (idiom); Start dancing!; fig. things fit together at one go; to click together; to chime in easily |
| 一扫而空 | yī sǎo ér kōng | to sweep clean; to clean out |
| 一排 | yī pái | row |
| 一掬同情之泪 | yī jū tóng qíng zhī lèi | to shed tears of sympathy (idiom) |
| 一拨儿 | yī bōr | group of people |
| 一拥而上 | yī yōng ér shàng | to swarm around; flocking (to see) |
| 一拥而入 | yī yōng ér rù | to swarm in (of people etc) (idiom) |
| 一掷千金 | yī zhì qiān jīn | lit. stake a thousand pieces of gold on one throw (idiom); to throw away money recklessly; extravagant |
| 一揽子 | yī lǎn zi | all-inclusive; undiscriminating |
| 一改故辙 | yī gǎi gù zhé | complete change from the old rut (idiom); dramatic change of direction; a volte-face; to change old practices |
| 一文不值 | yī wén bù zhí | worthless (idiom); no use whatsoever |
| 一斑 | yī bān | lit. one spot (on the leopard); fig. one small item in a big scheme |
| 一方 | yī fāng | a party (in a contract or legal case); one side; area; region |
| 一方面 | yī fāng miàn | one aspect is |
| 一族 | yī zú | social group; subculture; family; clan; see also 族 |
| 一日千里 | yī rì qiān lǐ | lit. one day, a thousand miles (idiom); rapid progress |
一日为师，
终身为父 | yī rì wéi shī ,
zhōng shēn wéi fù | lit. teacher for one day, father for ever (idiom) |
| 一时半刻 | yī shí bàn kè | a short time; a little while |
