warble

nouns

a lumpy abscess under the hide of domestic mammals caused by larvae of a botfly or warble fly
warble
is a type of (narrower)
a disease that typically does not affect human beings
animal disease

verbs

sing or play with trills, alternating with the half note above or below
quaver, trill, warble
is derived from
warbler
sing by changing register; sing by yodeling
"The Austrians were yodeling in the mountains"
descant, warble, yodel