Someone who likes to talk about other people's private or personal business.

“Be careful what you say to him: he’s a bit of a gossip.”

Idle talk about someone’s private or personal matters, especially someone not present.

“According to the latest gossip, their relationship is on the rocks.”

Idle conversation in general.

To talk about someone else's private or personal business, especially in a manner that spreads the information.

To talk idly.

To stand godfather to; to provide godparents for.