trill

Definition (noun): a note that alternates rapidly with another note a semitone above it

Definition (noun): the articulation of a consonant (especially the consonant `r’) with a rapid flutter of the tongue against the palate or uvula

Example: he pronounced his R’s with a distinct trill

Definition (verb): pronounce with a trill, of the phoneme `r’

Example: Some speakers trill their r’s

Definition (verb): sing or play with trills, alternating with the half note above or below