What sound does an O make with a line over it?

The sound of "O" with a line over it depends on the language you're referring to. It's a common symbol in different languages, each with its own meaning and pronunciation.

Here are some possibilities:

* In Spanish, "Ó" is pronounced like the "o" in "go" or "so," with a longer, slightly more drawn-out sound.

* In French, "Ô" is pronounced like the "o" in "go," but with a slightly more open, relaxed sound.

* In Portuguese, "Ó" is pronounced like the "o" in "go," but with a slightly more nasalized sound.

* In some phonetic transcriptions, "ō" is used to represent a long "o" sound, like the "o" in "tone."

To determine the exact sound of "O" with a line over it, you need to know the context, such as the language and the specific word it's in.