What is stockfish? How to use in English

The word "stockfish" originates from the Old Norse term "stakkfiskr," which translates to "stick fish." This name comes from the traditional method of preserving fish, mainly cod, by hanging it on wooden poles to dry in the wind and air, forming elongated, rectangular shapes that resemble sticks. The term "stockfish" gained popularity during the Middle Ages when it became a staple food item in northern European countries due to its long storage capability and nutritional value. Over time, the term stockfish came to refer specifically to dried and salted cod, and it remains a popular ingredient in traditional Nordic cuisine today.