Solution: The verb with finger on it can obviously be associated with the idiom "forefinger moves greatly".
Interpretation: shí zhǐ dà dòng, originally refers to the omen of food, and later describes the greedy appearance when seeing delicious food. It also refers to the situation that there are some delicious foods in front of you and you are about to enjoy them.
Extended data:
1, source: "Zuo Zhuan for four years": "Chu people gave Ma Yuzheng, Zi Song and his son had a family meeting, and his forefinger moved." ?
2. Usage: as predicate and attribute; Refers to the omen of food.
References:
Baidu Encyclopedia _ forefinger big move