• (America) IPA: /ˈwɔɹbl̩/
• (RP) IPA: /ˈwɔːbl̩/

warble (warbles, present participle warbling; past and past participle warbled)

1. (transitive) To modulate a tone's frequency.
2. (transitive) To sing like a bird, especially with trills.
   • a. 1722, Matthew Prior, “Non Pareil”, in H. Bunker Wright, Monroe K. Spears, editors, The Literary Works of Matthew Prior, volume I, Second edition, Oxford: Clarendon Press, published 1971, page 683:

     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.

3. (transitive) To cause to quaver or vibrate.
   • 1634, John Milton, “Arcades”, in Poems of Mr. John Milton, […] , London: Printed by Ruth Raworth for Humphrey Moſely,  […], published 1645, OCLC 606951673 ↗:

     touch the warbled string

4. (intransitive) To be quavered or modulated; to be uttered melodiously.

   • Such strains ne'er warble in the linnet's throat.

• (to modulate a tone's frequency) trill

• Italian: cinguettare
• Russian: шебетать
• Spanish: trinar

warble

1. The sound of one who warbles; singing with trills or modulations.
2. (military) 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.

warble (plural warbles)

1. A lesion under the skin of cattle, caused by the larva of a bot fly of genus Hypoderma.
2. A small hard swelling on a horse's back, caused by the galling of the saddle.

• French: varron, varon
• German: Dasselbeule