ذَبَبَ → ذَبَّ
Translation: identical radicals are assimilated.
The source’s first essential rule describes three routes by which a difficult double consonant sequence is eased:
1. Regular assimilation (idghām qiyāsī).
2. Attested deletion (ḥadhf samāʿī), which should not be generalized without evidence.
3. Attested substitution (ibdāl samāʿī).
The distinctions keep the normal doubling rule separate from individually transmitted exceptions.
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Essential Rule 1: Three Ways of Lightening Doubling
Doubled Verbs: Complete Conjugation of ذَبَّ يَذُبُّ, Explanations and Essential Rules
ذَبَبَ → ذَبَّ
Translation: identical radicals are assimilated.
The source’s first essential rule describes three routes by which a difficult double consonant sequence is eased:
1. Regular assimilation (idghām qiyāsī).
2. Attested deletion (ḥadhf samāʿī), which should not be generalized without evidence.
3. Attested substitution (ibdāl samāʿī).
The distinctions keep the normal doubling rule separate from individually transmitted exceptions.