trill
US /trɪl/
UK /trɪl/

1.
trinado, trilo
a quavering or vibratory sound, especially a rapid alternation between two musical notes a semitone or tone apart
:
•
The bird's song ended with a beautiful trill.
A canção do pássaro terminou com um belo trinado.
•
She added a delicate trill to the melody.
Ela adicionou um delicado trinado à melodia.