Infitāḥ is opposed to iṭbāq. The book assigns it to the twenty-five letters other than ص ض ط ظ. They lack the distinctive iṭbāq closure or near-contact.
An important contrast: خ، غ، ق have istiʿlāʾ but not iṭbāq, and therefore have infitāḥ. This prevents the false assumption that every elevated-tongue consonant must also be a muṭbaq letter.
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Infitāḥ: opposite of iṭbāq
Ṣifāt al-Ḥurūf — Opposing Qualities and Strength Grades
Infitāḥ is opposed to iṭbāq. The book assigns it to the twenty-five letters other than ص ض ط ظ. They lack the distinctive iṭbāq closure or near-contact.
An important contrast: خ، غ، ق have istiʿlāʾ but not iṭbāq, and therefore have infitāḥ. This prevents the false assumption that every elevated-tongue consonant must also be a muṭbaq letter.