be well (/universally)known; be common knowledge; be known to all (/everybody); everybody knows that…/张作霖之死～是日本人谋杀的。(爱新觉罗·溥仪《我的前半生》218) It is common knowledge that Zhang Zuolin was mur dered by the Japanese. ❍ 至于断绝八路军接济，……等等事实，更是～。(《毛泽东选集》874) It is particularly notorious that promised supplies have been cut off from the Eighth Route Army and…，etc.
尽人皆知
be known to all;be common knowledge
尽人皆知jìn rén jiē zhī
全部的人都知道。be known to all, upon the table, widen known, be a proverb for