~ 1
■ verb (of a bird) sing softly and with a succession of constantly changing notes.
↘(of a person) sing in a trilling or quavering voice.
■ noun a warbling sound or utterance.
Origin
ME (as a noun in the sense 'melody'): from Old North. Fr. werble (n.), werbler (v.), of Gmc origin; related to whirl .
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~ 2
■ noun a swelling or abscess beneath the skin on the back of cattle, horses, and other mammals, caused by the presence of the larva of a ~ fly.
↘the larva causing this.
Origin
ME: of uncertain origin.