اِقْشَعَرَّ has a doubled final rāʾ. Its verbal noun اِقْشِعْرَار displays the root consonant sequence in a different vocalic and lengthened arrangement.
يَقْشَعِرُّ — his hair stands on end.
مُقْشَعِرٌّ — one experiencing the shudder; active participle.
The doubled final consonant remains visible in the imperfect and participle. Although this and the preceding pattern both begin with a connecting hamza, their internal structural changes differ.
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Gemination and the verbal noun iqshiʿrār
The Four Unaugmented and Augmented Quadriliteral Patterns
اِقْشَعَرَّ has a doubled final rāʾ. Its verbal noun اِقْشِعْرَار displays the root consonant sequence in a different vocalic and lengthened arrangement.
يَقْشَعِرُّ — his hair stands on end.
مُقْشَعِرٌّ — one experiencing the shudder; active participle.
The doubled final consonant remains visible in the imperfect and participle. Although this and the preceding pattern both begin with a connecting hamza, their internal structural changes differ.