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Dou means the great cold in the twenty-four solar terms.

One of the 24 solar terms. The solar calendar 1 20th or 2 1 day is generally the coldest time in China. Yizhoushu Zhou said: "Winter and March are full of energy: light snow, winter solstice, great cold." Han Dong's book "Spring and Autumn Stories, Up and Down of Yin and Yang": "Light snow makes things salty, and cold makes things hidden." It's very cold. Lu Chunqiu: "Great cold, great heat, dry work, great humidity, strong wind, heavy rain and fog, seven evils." "The History of the New Five Dynasties, Biography of Jin Officials, Wu Luan": "Shan Ye is good at caressing his foot soldiers, and he will be extremely cold, tearing it to serve his foot soldiers, and all the foot soldiers love it.