Webster's Revised Unabridged Dictionary · 1913

Warble

Warble , noun

[Compare Wormil.]

1.
(a) (Farriery) A small, hard tumor which is produced on the back of a horse by the heat or pressure of the saddle in traveling.
(b)
(Farriery) A small tumor produced by the larvae of the gadfly in the backs of horses, cattle, etc. Called also warblet, warbeetle, warnles.
2.
(Zoology) See Wormil.

Warble , transitive verb

[Old English werbelen, Old French werbler; of Teutonic origin; compare German wirbeln to turn, to warble, Dutch wervelen, akin to English whirl. See Whirl.]

1.
To sing in a trilling, quavering, or vibratory manner; to modulate with turns or variations; to trill; as, certain birds are remarkable for warbling their songs.
2.
To utter musically; to modulate; to carol.
If she be right invoked in warbled song. — Milton
Warbling sweet the nuptial lay. — Trumbull
3.
To cause to quaver or vibrate.
And touch the warbled string. — Milton

Warble , intransitive verb

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 , noun

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