warbled

/W AO1 R B AH0 L D/
verb
  1. 1

    To modulate a tone's frequency.

  2. 2

    To sing like a bird, especially with trills.

  3. 3

    To cause to quaver or vibrate.

  4. 4

    To be quavered or modulated; to be uttered melodiously.

Synonyms

Source: https://en.wiktionary.org/wiki/warble, https://en.wiktionary.org/wiki/warbled