| 四大须生 | sì dà xū shēng | Four great beards of Beijing opera, namely: Ma Lianliang 马连良, Tan Fuying 谭富英, Yang Baosen 杨宝森, Xi Xiaobo 奚啸伯 |
| 四天 | sì tiān | four days |
| 四子王 | Sì zǐ wáng | Siziwang banner or Dörvön-xüüxed khoshuu in Ulaanchab 乌兰察布, Inner Mongolia |
| 四子王旗 | Sì zǐ wáng qí | Siziwang banner or Dörvön-xüüxed khoshuu in Ulaanchab 乌兰察布, Inner Mongolia |
| 四季如春 | sì jì rú chūn | four seasons like spring; favorable climate throughout the year |
| 四季豆 | sì jì dòu | green bean; French bean; runner bean |
| 四季豆腐 | sì jì dòu fu | four seasons beancurd |
| 四小龙 | Sì Xiǎo lóng | Four Asian Tigers; East Asian Tigers; Four Little Dragons (East Asian economic powers: Taiwan, South Korea, Singapore and Hong Kong) |
| 四川大地震 | Sì chuān dà dì zhèn | Sichuan great earthquake; the magnitude 8 earthquake of May 2008 at Wenchuan 汶川, Sichuan, that killed more than 80,000 people |
| 四川大学 | Sì chuān Dà xué | Sichuan University |
| 四川日报 | Sì chuān rì bào | Sichuan Daily |
| 四平八稳 | sì píng bā wěn | everything steady and stable (idiom); overcautious and unimaginary |
| 四平地区 | Sì píng dì qū | former Siping prefecture, Jilin |
| 四平市 | Sì píng shì | Siping prefecture level city in Jilin province 吉林省 in northeast China |
| 四年制的大学 | sì nián zhì de dà xué | four-year university |
| 四年前 | sì nián qián | four years previously |
| 四库 | sì kù | the four book depositories, namely: classics 经, history 史, philosophy 子, belle-lettres 集 |
| 四库全书 | sì kù quán shū | Siku Quanshu (collection of books compiled during Qing dynasty) |
| 四强 | sì qiáng | semifinals |
| 四德 | sì dé | four Confucian injunctions 孝悌忠信 (for men), namely: piety 孝 to one's parents, respect 悌 to one's older brother, loyalty 忠 to one's monarch, faith 信 to one's male friends; the four Confucian virtues for women of morality 德, physical charm 容, propriety in speech 言 and efficiency in needlework 功 |
| 四方区 | Sì fāng qū | Sifang district of Qingdao city 青岛市, Shandong |
| 四方步 | sì fāng bù | a slow march |
| 四方脸 | sì fāng liǎn | square-jawed face |
| 四方台 | Sì fāng tái | Sifangtai district of Shuangyashan city 双鸭山, Heilongjiang |
| 四方台区 | Sì fāng tái qū | Sifangtai district of Shuangyashan city 双鸭山, Heilongjiang |
| 四方响应 | sì fāng xiǎng yìng | a response from every direction (idiom) |
| 四日市 | Sì rì shì | Yokaichi City in Mi'e prefecture 三重县, Japan |
| 四日市市 | Sì rì shì shì | Yokkaichi, Mie prefecture 三重县, Japan |
| 四旬节 | sì xún jié | First Sunday of Lent |
| 四旬斋 | sì xún zhāi | Lent (Christian period of forty days before Easter) |
| 四更 | sì gēng | fourth of the five night watch periods 01:00-03:00 (old) |
| 四会 | Sì huì | Sihui county level city in Zhaoqing 肇庆, Guangdong |
| 四会市 | Sì huì shì | Sihui county level city in Zhaoqing 肇庆, Guangdong |
| 四月 | sì yuè | April; fourth month (of the lunar year) |
| 四月份 | sì yuè fèn | April |
| 四次 | sì cì | fourth; four times; quartic |
| 四氟化硅 | sì fú huà guī | silicon tetrafluoride SiF4 |
| 四氟化铀 | sì fú huà yóu | uranium tetrafluoride (UF4) |
| 四氢大麻酚 | sì qīng dà má fēn | Tetrahydrocannabinol, THC |
| 四氯乙烯 | sì lǜ yǐ xī | tetrachloroethylene |
| 四海升平 | sì hǎi shēng píng | lit. all four oceans are peaceful; worldwide peace (idiom) |
| 四海为家 | sì hǎi wéi jiā | to regard the four corners of the world all as home (idiom); to feel at home anywhere; to roam about unconstrained; to consider the entire country, or world, to be one's own |
| 四海皆准 | sì hǎi jiē zhǔn | appropriate to any place and any time (idiom); universally applicable; a panacea |
| 四海飘零 | sì hǎi piāo líng | drifting aimlessly all over the place (idiom) |
| 四清 | sì qīng | see 四清运动; the “Four Clean-ups” Movement |
| 四清运动 | sì qīng yùn dòng | the “Four Clean-ups” Movement (1963-66), a nationwide movement to clean things up in the fields of politics, economy, organization and ideology (historical) |
| 四湖 | Sì hú | Si or Ssuhu township in Yunlin county 云林县, Taiwan |
| 四湖乡 | Sì hú xiāng | Si or Ssuhu township in Yunlin county 云林县, Taiwan |
| 四溅 | sì jiàn | (foam flying) in all directions |
| 四物汤 | sì wù tāng | four-substance decoction (si wu tang), tonic formula used in Chinese medicine |
