It depends on the context. Most likely it means how something ends up, like a result (The guys turned out to be a jerk, The pizza turned out OK). You can also turn something out as in produce (The factory was turnning out thousands of toys every hour). People can turn out as in gather for an event (which is also known as a turnout). You can also turn something out as in turn something off, like a light bulb.

Can you provide the complete sentence? The meaning depends on the context.