What verb has been defined in this manner: "To suddenly and repeatedly change from a natural voice to a falsetto and back again."

The unique vocal technique described is achieved by a singer making an abrupt and repeated switch between their low-pitched chest voice and their high-pitched head voice, or falsetto. This rapid change in pitch creates a distinctive, warbling sound that is instantly recognizable as yodeling. The key to the sound is not just singing high notes, but the quick break or flip between the two vocal registers, often performed on vowel sounds.

While most people associate this singing style with the folk music of Switzerland and Austria, it likely originated as a practical tool rather than a form of entertainment. In the mountainous terrain of the Alps, yodeling developed as a highly effective method of long-distance communication. The alternating high and low frequencies allowed the sound to carry across deep valleys and rugged landscapes, enabling herders to call their livestock or communicate with people in neighboring villages.

Over time, this utilitarian call evolved into a complex and artistic musical form, celebrated in folk songs and festivals. The style later crossed the Atlantic and was famously incorporated into early American country music by performers like Jimmie Rodgers, who became known for his signature "blue yodel." This fusion introduced the Alpine sound to a brand new audience and cemented its place in global music history.