warble

n.

  1. A small, hard tumor which is produced on the back of a horse by the heat or pressure of the saddle in traveling.
  2. A small tumor produced by the larvae of the gadfly in the backs of horses, cattle, etc. Called also warblet, warbeetle, warnles.
  3. See Wormil.
  4. A quavering modulation of the voice; a musical trill; a song.

v. t.

  1. To sing in a trilling, quavering, or vibratory manner; to modulate with turns or variations; to trill; as, certain birds are remarkable for warbling their songs.
  2. To utter musically; to modulate; to carol.
  3. To cause to quaver or vibrate.

v. i.

  1. To be quavered or modulated; to be uttered melodiously.
  2. To sing in a trilling manner, or with many turns and variations.
  3. To sing with sudden changes from chest to head tones; to yodel.