冬至
The first character is the one for winter, one of two times the name of the season appears in the name of a solar term (all seasons follow the same pattern: first a "Start of season" term, and later a term named for the astronomical event, solstice or equinox). I may have written this before: the second character conveys the idea of a destination point, the end of a journey. For example, it appears on underground trains, following the name of the end station, meaning "train goes to [end station]". It is a good description of the winter solstice - the end point, or the deepest point, of winter.
