a note that alternates rapidly with another note a semitone above it पर्याय: shake,
the articulation of a consonant (especially the consonant `r'') with a rapid flutter of the tongue against the palate or uvula; "he pronounced his R''s with a distinct trill"
sing or play with trills, alternating with the half note above or below पर्याय: warble, quaver,
pronounce with a trill, of the phoneme `r''; "Some speakers trill their r''s"
मोबाइल