warble (n.)

1.a lumpy abscess under the hide of domestic mammals caused by larvae of a botfly or warble fly

2.(fledgling)a sharp sound made by small birds or insects

warble (v.)

1.sing by changing register; sing by yodeling"The Austrians were yodeling in the mountains"

2.sing or play with trills, alternating with the half note above or below

3.(fledgling)make high-pitched sounds; of birds