Back nines refers to golfing terminology, which refers to the last nine holes in a round of golf. The front nine would be the first nine holes, and the back nine would be the last nine holes. The term can also be used for any kind of nine-hole golf course.
Typically, the back nine can provide a different experience than the front nine, as the layout of the holes can be quite different. The back nine may also include more difficult shots and challenging greens to play. Furthermore, due to the changing conditions throughout the day, the back nine will often play differently than the front nine.
The phrase "back nine" can also signify the last nine holes in one's life or career, implying that the back nine is where the golfer can finally relax and savor the game, after all of the hard work and effort involved for the front nine.
Overall, the term "back nine" is used to refer to either the last nine holes in a round of golf, or any nine-hole golf course. Additionally, it can also be used in a more figurative sense to describe the last part of a golfer's life or career.