warble
war|ble /w'ɔːrbəl/ (warbles warbling warbled)
1 [VERB] V, V n
When a bird warbles, it sings pleasantly.
The bird continued to warble...
A flock of birds was already warbling a cheerful morning chorus.
2 [VERB] V, V n
If someone warbles, they sing in a high-pitched, rather unsteady voice.
She warbled as she worked.
...singers warbling `Over the Rainbow'.
1 [VERB] V, V n
When a bird warbles, it sings pleasantly.
The bird continued to warble...
A flock of birds was already warbling a cheerful morning chorus.
2 [VERB] V, V n
If someone warbles, they sing in a high-pitched, rather unsteady voice.
She warbled as she worked.
...singers warbling `Over the Rainbow'.