warbles

noun

1. 1.The sound of one who warbles; singing with trills or modulations.
2. 2.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.
3. 3.A lesion under the skin of cattle, caused by the larva of a bot fly of genus Hypoderma.
4. 4.A small hard swelling on a horse's back, caused by the galling of the saddle.