Learn Danish: Det gør ondt.

In Danish, there isn't a single common verb that means "to hurt." Instead, you use the fixed phrase at gøre ondt, which literally translates to "to do bad" or "to make pain."

What exactly is the word ondt?

Ondt is the neuter form of the adjective ond, which normally means "evil" or "bad." In this specific phrase, it is used to mean "pain" or "hurt."

How do I pronounce ondt? Is the "d" silent?

Yes, the "d" is completely silent. You pronounce the word as if it were spelled "ont."

If I want to say a specific body part hurts, like "My leg hurts," do I use this exact sentence?

You can say Mit ben gør ondt (My leg hurts), but it is actually much more common in Danish to use the verb at have (to have) for body parts. A Dane will usually say Jeg har ondt i benet, which literally means "I have pain in the leg."