To make the low vocal sound of some birds.
A low vocal sound made by some birds.
To sing like a bird, especially with trills.
To cause to quaver or vibrate.
To modulate a tone's frequency.
To be quavered or modulated; to be uttered melodiously.
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.
A small hard swelling on a horse's back, caused by the galling of the saddle.
The sound of one who warbles; singing with trills or modulations.
A lesion under the skin of cattle, caused by the larva of a bot fly of genus Hypoderma.