, (T, S, M, K,) and ↓تثنّى, and ↓اِثَّنَى, of the measure اِفْتَعَلَ, (M, K,) originally اِثْتَنَى, (M,) and ↓اِثْنَوْنَى, (T, S, K,) of the measure اِفْعَوْعَلَ, (T, S,) It was, or became, doubled, or folded; (T;) it had one part turned upon another; (M, K;) it was, or became, bent. (T, S.)
2.
[Hence,] انثنى signifies also He turned, or turned away or back, (Har pp. 44 and 120,) عَنْ أَمْرٍfrom an affair, after having determined to do it. (Lth in TA article زمع.)