warbling

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

Origin: ME werblen < NormFr werbler < Frank *wirbilon, akin to Ger wirbeln, to whirl, warble

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