Definitions from Wiktionary (warble)

▸ verb:  (transitive) To modulate a tone's frequency.
▸ verb:  (transitive) To sing like a bird, especially with trills.
▸ verb:  (transitive) To cause to quaver or vibrate.
▸ verb:  (intransitive) To be quavered or modulated; to be uttered melodiously.
▸ noun:  The sound of one who warbles; singing with trills or modulations.
▸ noun:  (military) In naval mine warfare, the process of varying the frequency of sound produced by a narrowband noisemaker to ensure that the frequency to which the mine will respond is covered.
▸ noun:  A lesion under the skin of cattle, caused by the larva of a bot fly of genus Hypoderma.
▸ noun:  A small hard swelling on a horse's back, caused by the galling of the saddle.

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