warble

transitive verb warbled, warbling

1. to sing (a song, notes, etc.) melodiously, with trills, quavers, runs, etc., as a bird does
2. to express in song

intransitive verb

1. to sing melodiously, with trills, etc.
2. to make a musical sound; babble, as a stream does
3. ☆ yodel

noun

1. the act of warbling
2. a warbling sound; trill

noun

1. a small, hard tumor on the back of a horse, caused by the rubbing and pressing of a saddle
2. a lump or swelling under the hide of an animal, esp. on the back, caused by the presence of a larva of a botfly, esp. a warble fly