气贯长虹 literally means 'qi surging through the long rainbow'—a vivid classical image evoking unstoppable energy, heroic spirit, or overwhelming momentum. The character 气 (qì) refers to vital energy or spirit; 贯 (guàn) means 'to penetrate' or 'to run through'; 长 (cháng) means 'long'; and 虹 (hóng) is 'rainbow'. Together, they form an idiom describing a forceful, uplifting, and majestic presence—often used for powerful speeches, athletic performances, or bold artistic expressions that stir deep admiration.

This four-character idiom belongs to the literary register and appears frequently in formal writing, news reports, and commentary on exceptional human achievement. It carries strong positive connotations of vigor, confidence, and moral strength—not physical force alone, but inspired, righteous energy. While rooted in traditional Chinese cosmology and martial arts philosophy, it’s widely understood today as a metaphor for peak performance with emotional resonance and grandeur.