The word "快要" is formed through the direct combination of two independent characters, each contributing its core meaning to create a new, unified concept. The first character, "快", carries the fundamental idea of "quick" or "soon", while the second, "要", introduces the notion of "will" or "about to". Their formation is not arbitrary but a logical semantic pairing where "要" specifies the impending nature of the action or state, and "快" intensifies its immediacy, resulting in a compound that conveys the sense of something being on the very brink of happening.