The word "惹火" is formed by directly combining the character "惹", which carries the sense of provoking or inviting, with "火", meaning fire, to create a metaphorical expression. Here, the concrete image of fire is used to symbolize intense, heat-like emotions such as anger or desire, so the compound naturally evokes the concept of inciting strong reactions, whether irritating someone or being provocatively attractive, through this vivid figurative blend.