‘呼啸’ is a vivid, onomatopoeic verb describing a loud, high-pitched sound produced by fast-moving air—most commonly the wind howling or whistling through narrow spaces like mountain passes, tunnels, or bare branches. The character 呼 (hū) means ‘to exhale’ or ‘to call out’, evoking breath or forceful emission; 啸 (xiào) means ‘to whistle’ or ‘to shriek’, often associated with sharp, piercing sounds—especially those made by animals (e.g., wolves) or natural forces. Together, they intensify each other, creating an image of unrestrained, dynamic sound.

This word is frequently used in descriptive writing and spoken language to convey drama, speed, or wildness. It appears in literary contexts (e.g., describing stormy weather), news reports (e.g., trains or jets passing at high speed), and even metaphorically for rapid movement (e.g., time ‘whistling’ by). It’s rarely used for human speech—it emphasizes natural or mechanical force, not intentional vocalization.