The shaddah on thāʾ in اِثَّاقَلَ represents an assimilated consonantal sequence, not mere decorative pronunciation. The form is morphologically related to تَثَاقَلَ.
يَثَّاقَلُ — he becomes heavy or sluggish.
لَا تَثَّاقَلْ — do not become sluggish!
In such forms, the surface spelling and the underlying morphological analysis must be distinguished; otherwise the doubled letter can be miscounted.
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Assimilation in اِثَّاقَلَ
Nine Augmented Triliteral Patterns with Hamzat al-Wasl
The shaddah on thāʾ in اِثَّاقَلَ represents an assimilated consonantal sequence, not mere decorative pronunciation. The form is morphologically related to تَثَاقَلَ.
يَثَّاقَلُ — he becomes heavy or sluggish.
لَا تَثَّاقَلْ — do not become sluggish!
In such forms, the surface spelling and the underlying morphological analysis must be distinguished; otherwise the doubled letter can be miscounted.