Mahabharata 8.5.102

केऽरक्षन्दक्षिणं चक्रं सूतपुत्रस्य संयुगेवामं चक्रं ररक्षुर्वा के वा वीरस्य पृष्ठतः

ke'rakṣandakṣiṇaṃ cakraṃ sūtaputrasya saṃyugevāmaṃ cakraṃ rarakṣurvā ke vā vīrasya pṛṣṭhataḥ

Our plain-language meaning of this verse is waiting for scholar review.