Mahabharata 5.188.18

उक्त्वा भीष्मवधायेति प्रविवेश हुताशनम्ज्येष्ठा काशिसुता राजन्यमुनामभितो नदीम्

uktvā bhīṣmavadhāyeti praviveśa hutāśanamjyeṣṭhā kāśisutā rājanyamunāmabhito nadīm

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