披散 (pī sǎn) is a verb meaning 'to let one's hair hang loose' — typically describing hair that falls freely over the shoulders or back, unbound and untied. The first character 披 (pī) conveys the idea of spreading out or draping over something, like a cloak; the second character 散 (sǎn) means 'to scatter' or 'to disperse', suggesting looseness and lack of constraint. Together, they vividly evoke the visual and physical state of unrestrained, flowing hair.

This word is commonly used in descriptive writing — especially in literature, poetry, or everyday observations about appearance — to convey naturalness, relaxation, or even emotional states like fatigue or carefree abandon. It often appears with subjects like 她 (tā, 'she'), 长发 (cháng fà, 'long hair'), or 头发 (tóu fà, 'hair') and frequently pairs with verbs like 拥有 (yǒng yǒu, 'to have'), 看起来 (kàn qǐ lái, 'to look'), or 任由 (rèn yóu, 'to allow'). It’s not used for short or styled hair, nor for hair tied up or clipped.