昨非今是 zuófēijīnshì to realize one's past mistakes Origin Definitions Defs Strokes Stroke Words Sentences Sents 昨 zuó noun past (literary) the past; previous times非 fēi wrong mistake; error; a wrong or evil deed; incorrect as opposed to 是 shì今 jīn noun the present (bound form) now; the present; this (day, year, etc.)是 shì verb correct right; true; just; often used in contrast with 非 fēi