warble

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To sing (a note or song, for example) with trills, runs, or other melodic embellishments.
2. v. To sing with trills, runs, or quavers.
3. v. To be sounded in a trilling or quavering manner.
4. n. The act or an instance of singing with trills, runs, or quavers.
5. n. An abscessed boillike swelling on the back of cattle, deer, and certain other animals, caused by the larva of a warble fly.
6. n. The warble fly, especially in its larval stage.
7. n. A hard lump of tissue on a riding horse's back caused by rubbing of the saddle.

Century Dictionary and Cyclopedia

1. To sing with trills and quavering, or melodious turns, as a bird; carol or sing with sweetly trilling notes.
2. To sound vibratingly, or with free, smooth, and rapid modulations of pitch; quaver.
3. To yodel.
4. To sing or utter with quavering trills or turns: as, to warble a song.
5. To describe or celebrate in song.
6. n. A strain of clear, rapidly uttered, gliding tones; a trilling, flexible melody; a carol; a song; any soft sweet flow of melodious sounds.
7. In falconry, to cross the wings upon the back.
8. n. A small, hard swelling on the back of a horse, produced by the galling of the saddle.
9. n. A tumor on the back of cattle or doer, produced by the larva of a bot-fly or gadfly.
10. n. An insect or its larva which produces warbles. Also warbeetle. Compare wabble.

Wiktionary

1. v. to modulate a tone's frequency
2. v. to sing like a bird, especially with trills.
3. n. a lesion under the skin of cattle, caused by the larva of a bot fly of genus Hypoderma.
4. n. military In naval mine warfare, the process of varying the frequency of sound produced by a narrow band noisemaker to ensure that the frequency to which the mine will respond is covered.

GNU Webster's 1913

1. n. A small, hard tumor which is produced on the back of a horse by the heat or pressure of the saddle in traveling.
2. n. A small tumor produced by the larvæ of the gadfly in the backs of horses, cattle, etc. Called also warblet, warbeetle, warnles.
3. n. (Zoöl.) See Wormil.
4. v. To sing in a trilling, quavering, or vibratory manner; to modulate with turns or variations; to trill.
5. v. To utter musically; to modulate; to carol.
6. v. To cause to quaver or vibrate.
7. v. To be quavered or modulated; to be uttered melodiously.
8. v. To sing in a trilling manner, or with many turns and variations.
9. v. To sing with sudden changes from chest to head tones; to yodel.
10. n. A quavering modulation of the voice; a musical trill; a song.

WordNet 3.0

1. v. sing by changing register; sing by yodeling
2. n. a lumpy abscess under the hide of domestic mammals caused by larvae of a botfly or warble fly
3. v. sing or play with trills, alternating with the half note above or below