The letter R includes sports betting terms tied to live odds movement, risk management, promotional offers, and rivalry-driven matchups across multiple sports. These definitions help clarify how betting markets behave in real time and how bettors evaluate performance and strategy. From real-time odds and reverse-line movement to ROI and risk-free bets, these terms reflect how sportsbooks adjust lines and how bettors interpret value, sharp action, and long-term profitability.