The phrase "turned up" means to arrive or appear unexpectedly or to happen unexpectedly. There are numerous synonyms for this expression, including materialize, surface, arise, emerge, crop up, come forth, spring up, show up, and pop up. All of these phrases refer to some event, person, or thing that suddenly appears or appears unexpectedly. These words are often used when something unexpected or surprising happens, like when a friend unexpectedly shows up at your doorstep or when a hidden talent suddenly emerges in someone. Ultimately, these synonyms emphasize the suddenness or surprise of a situation or event.