‘长啸’ literally combines ‘长’ (cháng), meaning 'long' or 'prolonged', and ‘啸’ (xiào), meaning 'to whistle' or 'to howl'—often with emotional intensity. Together, it describes the act of letting out a long, unrestrained, expressive whistle or cry, typically done outdoors and often associated with strong feelings like exhilaration, loneliness, defiance, or communion with nature. Historically, scholars and poets used it as a spontaneous, almost ritualistic release of inner emotion—sometimes imitating the calls of wild animals like wolves or cranes.

In modern usage, ‘长啸’ appears mainly in literary, poetic, or descriptive contexts—not everyday speech—and carries a classical, evocative tone. It’s frequently used to depict characters in historical dramas, mountain hermits, or animals (especially wolves or birds) expressing presence or mood. While humans can ‘长啸’, the term emphasizes duration, volume, and emotional resonance more than mere whistling—it’s less about signaling and more about vocal catharsis or symbolic expression.