trill

US /trɪl/
UK /trɪl/
"trill" picture
1.

a quavering or vibratory sound, especially a rapid alternation between two musical notes a semitone or tone apart

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The bird's song ended with a beautiful trill.
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She added a delicate trill to the melody.
:
vibrationquavertremolowarbleshake
1.

produce a trill

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The canary began to trill its morning song.
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She could trill her 'r's perfectly.
:
quavervibratetremblewarbleshake