In complete idghām, the earlier consonant is assimilated so its independent distinguishing articulation does not remain. The book cites قُلْ رَبِّ and وَقَالَتْ طَائِفَةٌ.
Let the second consonant govern the combined sound. Avoid producing the first fully and then starting the second afresh; that would defeat assimilation.
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Complete assimilation
Idghām: Types, Complete/Incomplete Assimilation and the Definite Article
In complete idghām, the earlier consonant is assimilated so its independent distinguishing articulation does not remain. The book cites قُلْ رَبِّ and وَقَالَتْ طَائِفَةٌ.
Let the second consonant govern the combined sound. Avoid producing the first fully and then starting the second afresh; that would defeat assimilation.