数九 shǔjiǔ coldest days Origin Definitions Defs Strokes Stroke Words Sentences Sents 数九寒天 shǔjiǔhántiān midwinter The nine periods of nine days following the winter solstice, marking the coldest time of the year.数九天 shǔjiǔtiān coldest winter days the nine nine-day periods after the winter solstice, traditionally the coldest time of year