intransitive verb
Definition: To make a series of quick, high-pitched sounds, often like a musical note or a bird's call.
Example: The bird began to trill happily in the morning sun.
noun
Definition: A quick, shaking sound made by birds or a rapid vibration in speech, often produced by the tongue. It can also refer to a musical effect where two notes are played in quick succession.
Example: The bird's trill filled the air with a cheerful melody.
transitive verb
Definition: To produce a series of rapid, vibrating sounds, often used in music or speech.
Example: The musician can trill the notes beautifully on the flute.