Meaning and idiom explanation of forefinger movement

The forefinger moves greatly:

Pinyin: shízhádàng

Explanation: It originally refers to the omen of delicious food, and later describes the greedy appearance when you see delicious food.

Source: Four Years of Zuo Zhuan by Lu Zuo Qiuming in the Spring and Autumn Period: "Chu people gave Zheng, Zi Song and his son a family meeting. When the son's index finger moves to his son's family, he will taste that strange smell. "

Grammar: as predicate and attribute; Refers to the omen of food.

Idiom story: During the Spring and Autumn Period, the Chu people gave Zheng several chinemys reevesii. When Dr. Zigong heard the news, he told his son Guisheng that as long as the index finger moved, there would be delicious food. Son Guisheng and son Gong went to eat soft-shelled turtle together. Zheng was disgusted with him and asked his attendants not to give him the soft-shelled turtle on purpose. Zigong threw away the plate and dipped his forefinger in some soup and tasted it.