It's a very common verb in French, and it's used in many different contexts.
Here are some examples:
* "Il a dit qu'il viendrait." (He said he would come.)
* "Je te dirai la vérité." (I'll tell you the truth.)
* "Ne me dis pas que tu ne sais pas." (Don't tell me you don't know.)
It's important to note that "dire" is a very versatile verb and can be used in a wide variety of ways.
If you're looking for a word that means "dire" in the sense of "terrible" or "urgent", you would use "grave", "urgent", or "terrible" in French.