The word 勇气 is formed by combining two characters: 勇, which conveys the idea of bravery or daring, and 气, which represents spirit, energy, or vital force. Together, they create a conceptual fusion where the inherent quality of bravery (勇) is infused with the dynamic essence of spirit (气), resulting in a compound that embodies the notion of courage as an active, inner strength that enables one to confront fear or difficulty. This formation is a typical example of how Chinese words often synthesize abstract qualities by pairing a core attribute with a reinforcing element to express a unified and nuanced meaning.