the four social bonds: propriety, justice, integrity and honor
see 禮義廉恥|礼义廉耻[li3 yi4 lian2 chi3]
the four directions
the four limbs (Chinese medicine)
four-dimensional
Definitions (Wiktionary)
noun, literary
the southeastern, southwestern, northeastern and northwestern corners
noun
the four social bonds (propriety, justice, integrity, and honour)
noun, broadly, literary
the four directions; all directions
adj, attributive
four-dimensional
Definitions (Kaifangcidian)
（沒有對應漢語詞彙）
Examples (Wiktionary)
Mandarin
《五代史·冯道传》论曰：“礼义廉耻，国之四维，四维不张，国乃灭亡。”
《五代史·馮道傳》論曰：“禮義廉恥，國之四維，四維不張，國乃滅亡。”
“ wǔ dài shǐ féng dào zhuàn ” lùn yuē ： “ lǐ yì lián chǐ ， guó zhī sì wéi ， sì wéi bù zhāng ， guó nǎi miè wáng ． ”
Historical Records of the Five Dynasties: Biography of Feng Dao states, "Propriety, justice, integrity and a sense of shame are the four cardinal principles of a state; if the four cardinal principles are not upheld, the country will perish."