1. 素早く他の音とその半音上の音を交替させる音(a note that alternates rapidly with another note a semitone above it)
2. 口蓋または口蓋垂に対する舌の急速な振るえによる子音(特に子音『r』)の明瞭な発音(the articulation of a consonant (especially the consonant `r') with a rapid flutter of the tongue against the palate or uvula)