岔开 (chà kāi) is a verb meaning 'to diverge' or 'to split apart,' often describing paths, roads, rivers, or abstract things like opinions or topics. The character 岔 (chà) originally refers to a fork or branch point—such as where a road splits—and 开 (kāi) means 'to open' or 'to separate.' Together, they convey the idea of something physically or conceptually branching off from a common origin. It emphasizes the moment or result of separation rather than the process.

This word is commonly used in geographical or spatial contexts (e.g., roads, trails, rivers), but also appears metaphorically—for instance, when a conversation veers off-topic or when two people’s views begin to differ significantly. It carries a neutral tone and is standard in both spoken and written Mandarin, though more frequent in descriptive or narrative writing than in casual daily speech.