verb / noun
yodel
YOH-dul/ˈjəʊdl/
Singing that rapidly alternates between a normal voice and a high falsetto voice.
The singer yodels, switching quickly between her normal and falsetto voices.

Etymology
German jodeln is based on jo, a cry of joy. That exclamation underlies the name for the Swiss and Tyrolese singing style that alternates rapidly between ordinary voice and falsetto.
More examples
- His yodel echoes across the valley.
- She learns to yodel by practicing quick shifts into falsetto.
- The song ends with three lively yodels.
Forms
yodel · yodels · yodeled · yodeling
yodeler noun — Someone who sings with rapid register shifts.