Quaver
Part of speech: noun
Definition: a trembling shake. a trembling of the voice, as in speaking or singing. an eighth note, drawn as a crotchet (quarter note) with a tail.
Part of speech: verb
Definition: to shake in a trembling manner. to use the voice in a trembling manner, as in speaking or singing.
Warble
Part of speech: verb
Definition: to modulate a tone's frequencyto sing like a bird, especially with trills.
Part of speech: noun
Definition: a lesion under the skin of an animal, caused by a bot fly(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.