trill - noun

a note that alternates rapidly with another note a semitone above it

the articulation of a consonant (especially the consonant `r') with a rapid flutter of the tongue against the palate or uvula

trill - verb

• pronounce with a trill, of the phoneme `r'
• sing or play with trills, alternating with the half note above or below

trill - thesaurus

quaver   shake   warble