Dictionary entry

Warble (3)

Webster's Dictionary 1913

War″ble, v. i. 1. To be quavered or modulated; to be uttered melodiously.

Such strains ne'er warble in the linnet's throat. Gay.

3. To sing in a trilling manner, or with many turns and variations. “Birds on the branches warbling.” Milton.

3. To sing with sudden changes from chest to head tones; to yodel.