warble
verbUK /ˈwɔː.bəl/
US /ˈwɔːr.bəl/
To sing with a pretty, shaking sound like a bird.
The little bird warbled a sweet song in the tree.
OTHER MEANINGS
2. A gentle, shaking sound made when singing or playing music.
The singer's warble made the old song feel warm and soft.
3. To speak in a voice that goes up and down in a shaky way.
He warbled his excuse so nervously that nobody believed him.
4. A small lump or swelling on an animal's skin, often where a fly has laid an egg.
The farmer found a warble on the horse's back.