Tafashshī belongs to shīn (ش). The book explains it as the spread of sound through the mouth. It is a quality produced with the consonant's articulation, not a reason to prolong the sound indefinitely.
Contrast أَشْ and أَسْ. Both letters share hams and rikhāwah, but shīn has tafashshī. Keep the appropriate tongue-palate configuration while making the distinction.
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Tafashshī of shīn
Ṣifāt al-Ḥurūf — Opposing Qualities and Strength Grades
Tafashshī belongs to shīn (ش). The book explains it as the spread of sound through the mouth. It is a quality produced with the consonant's articulation, not a reason to prolong the sound indefinitely.
Contrast أَشْ and أَسْ. Both letters share hams and rikhāwah, but shīn has tafashshī. Keep the appropriate tongue-palate configuration while making the distinction.