LessonsProperties of the Six Basic Triliteral Forms: Contest, Transitivity, and Semantic PatternsQuiz

Ḍaraba also serves the contest-and-prevailing sense, but the book singles out particular root types: initially weak, hollow-yāʾ, and finally weak-yāʾ verbs in the stated mughālabah construction.
بَايَعَنِي زَيْدٌ فَبِعْتُهُ
Translation: Zayd competed in buying and selling with me, and I prevailed over him in that contest.
Here `بِعْتُ` reflects a hollow-yāʾ root. The case does not mean that every verb associated with a contest can arbitrarily be shifted to Ḍaraba.

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Ḍaraba: Contest with Certain Weak Roots

Properties of the Six Basic Triliteral Forms: Contest, Transitivity, and Semantic Patterns

Ḍaraba also serves the contest-and-prevailing sense, but the book singles out particular root types: initially weak, hollow-yāʾ, and finally weak-yāʾ verbs in the stated mughālabah construction.
بَايَعَنِي زَيْدٌ فَبِعْتُهُ
Translation: Zayd competed in buying and selling with me, and I prevailed over him in that contest.
Here `بِعْتُ` reflects a hollow-yāʾ root. The case does not mean that every verb associated with a contest can arbitrarily be shifted to Ḍaraba.