At Tafashshi
التفشي
This term literally means "Blowing" or "Breathing" or "shortness of breath" in Arabic.
Technically, At-tafashshî means the propagation of air in the
mouth during the pronunciation of the letter Shîn (ش) until reaching the point of articulation of Zâ
'(ظ), which corresponds to the internal part
of the incisors lower and upper.
This characteristic concerns the letter Shiin(ش), which correspond to the sound "ch" of the word
"short" in english!
Particularity designating the propagation of sound when pronouncing the letter(ش) from its point of articulation until
it strikes the internal part of the lower and upper incisors, and the diffusion of the air flow that creates this characteristic sound!
Producing a sound like a balloon that deflates!