- 七老八十 qīlǎobāshí very oldin one's seventies or eighties; very old (of people)
- 百儿八十 bǎirbāshí about a hundred(colloquial) approximately one hundred; a hundred or so
- 黄帝八十一难经 huángdìbāshíyīnànjīng The Yellow Emperor's Classic of Eighty-one DifficultiesThe Yellow Emperor's Classic of Eighty-one Difficulties; a classic Chinese medical text from approximately the 1st century AD
- 八十天环游地球 bāshítiānhuányóudìqiú Around the World in Eighty DaysAround the World in Eighty Days by Jules Verne
- 八十一分律 bāshíyīfēnlǜ 81-part systemalternate name for the Taichu calendar of the Han Dynasty, so named because it divided one day into eighty-one units
- 八十岁学吹鼓手 bāshísuìxuéchuīgǔshǒu too late(xiehouyu) to start learning a new skill when one is already old; too late to start something new
