3. To cause to quaver or vibrate. "And touch the warbled string." Milton.
WARBLE
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.
WARBLE
War"ble, n.
Defn: A quavering modulation of the voice; a musical trill; a song. And he, the wondrous child, Whose silver warble wild Outvalued every pulsing sound. Emerson.
WARBLER
War"bler, n.
1. One who, or that which, warbles; a singer; a songster; — applied chiefly to birds. In lulling strains the feathered warblers woo. Tickell.
2. (Zoöl.)