warble UK /ˈwɔːbl̩/US /ˈwɔɹbl̩/verb 4noun 4forms 5 verb4 •To sing like a bird, especially with trills.Her voice more sweet than warbling sound, Tho’ sung by nightingale or lark, Her eyes such lustre dart around, Compar’d to them the sun is dark. — 1722 •To modulate a tone's frequency. •To cause to quaver or vibrate. •To be quavered or modulated; to be uttered melodiously.The wailings of a maiden I recite, / A maiden fair, that Sparabella hight. / Such strains ne'er warble in the linnet's throat, / Nor the gay goldfinch chaunts so sweet a note, [...] — 1714 noun4 •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. •A small hard swelling on a horse's back, caused by the galling of the saddle. •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. formswarbled · warbling · warbles · warbleth · warblest