ذَبَبَ → ذَبَّ
Translation: the underlying two bāʾ radicals assimilated into a geminate.
Assimilation is a morphophonological operation, not a deletion of a root consonant. The root stays ذ ب ب.
When the 1st-person suffix attaches, the attested form is ذَبَبْتُ, not ذَبَّتُ. The suffix changes how the two adjacent radicals must be pronounced.
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Doubled Verbs: Complete Conjugation of ذَبَّ يَذُبُّ, Explanations and Essential Rules
ذَبَبَ → ذَبَّ
Translation: the underlying two bāʾ radicals assimilated into a geminate.
Assimilation is a morphophonological operation, not a deletion of a root consonant. The root stays ذ ب ب.
When the 1st-person suffix attaches, the attested form is ذَبَبْتُ, not ذَبَّتُ. The suffix changes how the two adjacent radicals must be pronounced.