Where does the word salted fish turn over come from?

When a person's life or career is at a low point, a sudden turn for the better and a sudden prosperity are often compared to a turnaround.

Salted fish can't "turn over" originally. To say that salted fish turns over means to come back to life, which means that the situation has changed from bad to good in a short time. "The property market is booming, and the salted fish turns over the old building and comes back to life" (Qianlong. Com 2000/ 12/20) "It is reported that at present, SAIC has sent relevant personnel to Yantai Body Factory to make preparations for receiving, and the domestic Blue Dragon sedan will be put on the market in an all-round way, and the Shandong Daewoo project will soon turn over the salted fish." (Economic Information Daily 2002/ 10/ 18) "Because of a good start, various media have used" salted fish to turn over ","winter goes to spring "and" dead wood meets spring "to describe a high-profile return to the market.

Also heard that there is such an allusion, I don't know who knows:

In the past, the poor family was so poor that they didn't have much food to entertain their guests that they had to get a salted fish. After the guests come, cook the batter and fry it to entertain the guests! And the guests also know the rules: only eat batter, not salted fish, because the next time the guests come, they have to fry the batter again and continue to entertain the guests!

So it takes more than a year to use a salted fish! I can't help it. )

But there are always some guests who don't obey the rules or don't know the rules, so they should eat a little. Or if the host wants to make way for the guests, the guests feel embarrassed and always eat a little, so there are fewer and fewer salted fish! When the salted fish is half eaten, it must be turned upside down!

This also indicates that the salted fish has been eaten half, almost finished, and it will be more difficult to buy another salted fish after eating!

Therefore, "turning over the salted fish" means that life will be more difficult, not a major turnaround. Later, borrowing the superficial meaning of idioms, this word is used to describe a person who suddenly turns around when he meets difficulties. Or are there two different explanations, just like polysemy?