warble

US /ˈwɔːr.bəl/
UK /ˈwɔːr.bəl/
"warble" picture
1.

to sing in a soft, low voice, especially with a trilling or quavering sound

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The bird began to warble a sweet melody.
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She would often warble old folk songs.
:
trillquaversingchirptwitter
1.

a trilling or quavering vocal sound, especially that of a bird

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The sweet warble of the nightingale filled the air.
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She listened to the gentle warble of the stream.
:
trillquaverchirptwittermelody