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plural vibratos
(music) The musical effect or technique where the pitch or frequency of a note or sound is quickly and repeatedly raised and lowered over a small distance for the duration of that note or sound. quotations examples
He felt his teeth methodically, one after the other, with a vibrato movement of finger and thumb.
1959, Anthony Burgess, Beds in the East (The Malayan Trilogy), published 1972, page 429