Mahabharata 1.122.43
तच्छ्रुत्वा कौरवेयास्ते तूष्णीमासन्विशां पतेअर्जुनस्तु ततः सर्वं प्रतिजज्ञे परंतपः
tacchrutvā kauraveyāste tūṣṇīmāsanviśāṃ patearjunastu tataḥ sarvaṃ pratijajñe paraṃtapaḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book