Meaning: winning/getting something by honest means.
Example: Howard said, “Oh! Come on now Peter! Be a sport. He played better than you and he won fair and square.”
Peter said, “Yes! I know and that is why it is so difficult to accept defeat. I need to practice more regularly. Let me go and congratulate the winner now.”
Howard liked this trait in Peter. He accepted the fact that he had flaws too. Howard decided to help him improve his game.