اِدَّعَى — اِزْدَحَمَ
Translation: he claimed; a crowd gathered.
The source’s rule 5 treats the t of the iftiʿāl pattern when it follows certain initial radicals, including dāl, dhāl and zāy. Their phonetic interaction may produce a changed surface consonant.
Do not assume that the root’s first radical has changed simply because the visible word differs from an unassimilated schematic pattern. First identify the root, then the added pattern consonant, and finally the substitution/assimilation.
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Rule 5: Iftiʿāl with Dāl, Dhāl and Zāy
Doubled Verbs: Complete Conjugation of ذَبَّ يَذُبُّ, Explanations and Essential Rules
اِدَّعَى — اِزْدَحَمَ
Translation: he claimed; a crowd gathered.
The source’s rule 5 treats the t of the iftiʿāl pattern when it follows certain initial radicals, including dāl, dhāl and zāy. Their phonetic interaction may produce a changed surface consonant.
Do not assume that the root’s first radical has changed simply because the visible word differs from an unassimilated schematic pattern. First identify the root, then the added pattern consonant, and finally the substitution/assimilation.