The sound of one who warbles; singing with trills or modulations.
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.
To modulate a tone's frequency.
To sing like a bird, especially with trills.
To cause to quaver or vibrate.
To be quavered or modulated; to be uttered melodiously.
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