Here's why:
* French: "De dire" in French means "to say" or "to tell". It is a common expression, but it's not a complete phrase on its own. It needs to be part of a larger sentence.
* Italian: "Di dire" in Italian also means "to say" or "to tell". It is similar to the French usage.
To understand the meaning properly, you need more context. For example, is there a full sentence where "de dire" appears?
Please provide more information so I can give you an accurate translation.