سَارَ الرَّجُلُ سَيْرًا سَرِيعًا
The man walked rapidly.
«سَيْرًا» is a cognate verbal noun, with «سَرِيعًا» specifying the manner of walking. The verb already reports walking; the complement adds its character. Likewise «ضَرَبْتُ ضَرْبَتَيْنِ» specifies two occurrences.
The cognate object may reinforce an action, specify its kind or enumerate it. It is not invariably decorative repetition; the rhetorical effect depends on what the complement contributes.
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سَارَ الرَّجُلُ سَيْرًا سَرِيعًا
The man walked rapidly.
«سَيْرًا» is a cognate verbal noun, with «سَرِيعًا» specifying the manner of walking. The verb already reports walking; the complement adds its character. Likewise «ضَرَبْتُ ضَرْبَتَيْنِ» specifies two occurrences.
The cognate object may reinforce an action, specify its kind or enumerate it. It is not invariably decorative repetition; the rhetorical effect depends on what the complement contributes.