वक्त्राणि ते त्वरमाणा विशन्ति दंष्ट्राकरालानि भयानकानि। केचिद्विलग्ना दशनान्तरेषु संदृश्यन्ते चूर्णितैरुत्तमाङ्गैः ॥

vaktrāṇi te tvaramāṇā viśanti daṁṣṭrā-karālāni bhayānakāni kecid vilagnā daśanāntareṣu sandṛśyante cūrṇitair uttamāṅgaiḥ

Into Thy gaping mouths they hurrying rush, Tremendous-toothed and terrible to see; Some caught within the gaps between Thy teeth Are seen, their heads to powder crushed and ground.

In plain words: Arjuna sees the warriors of both armies rushing into the huge, terrifying mouths of the cosmic form. Some are caught between its teeth, their heads crushed.