数九天 shǔjiǔtiān the coldest time of winter Origin Definitions Defs Strokes Stroke Words Sentences Sents 数九 數九 shǔjiǔ nine periods of nine days the nine nine-day periods following the winter solstice, traditionally considered the coldest time of the year天 tiān noun day a period of twenty-four hours; also used as a measurement for days or a specific time of day