‘飞走’ is a compound verb meaning 'to fly away' — literally combining 飞 (fēi, 'to fly') and 走 (zǒu, 'to go/leave'). Unlike many Chinese verbs that require aspect particles (e.g., 了, 过), 飞走 often appears without them when describing sudden or spontaneous departure, especially by birds or flying insects. It emphasizes both the mode (flying) and the direction (away from the speaker’s location or point of reference).

This word is commonly used in descriptive or narrative contexts — for example, observing wildlife, telling stories about pets or escaped animals, or poetic descriptions of nature. It carries a neutral-to-slightly-emotive tone; it can suggest loss, freedom, or simply natural behavior depending on context. While it’s grammatically simple (subject + 飞走), it rarely takes objects and is seldom used with directional complements like 进来 or 出去 — those would contradict its inherent 'away' meaning.