From FAQ: "Second:Go = If you do it, the 2:Go you try it, incl. the hang-dog or onsight/flash try."
Could you explain this term in simple words?
Does it mean just a repetition of a route? Or smth more/else?
Sorry ;)
The first time you try a route, it's an onsight or a flash. If you miss it you normally hang-dog to the top.
If you do it on the next try, you do it 2:go, i.e. the first redpoint attempt. Good luck!
2:go term