The word "偿还" is formed by combining the characters "偿" and "还". "偿" means to compensate or repay and is structured with the radical "亻" (person) and the component "尝", which provides phonetic and semantic clues. "还" means to return or give back and is structured with the radical "辶" (walk) and the component "不", contributing to its meaning of return. Together, they create a compound word where "偿" emphasizes repayment and "还" emphasizes the act of returning, thus conveying the overall meaning of repaying a debt or obligation.