द्यावापृथिव्योरिदमन्तरं हि व्याप्तं त्वयैकेन दिशश्च सर्वाः। दृष्ट्वाऽद्भुतं रूपमुग्रं तवेदं लोकत्रयं प्रव्यथितं महात्मन् ॥

dyāv ā-pṛithivyor idam antaraṁ hi vyāptaṁ tvayaikena diśhaśh cha sarvāḥ dṛiṣhṭvādbhutaṁ rūpam ugraṁ tavedaṁ loka-trayaṁ pravyathitaṁ mahātman

By Thee alone are filled the earth, the heavens, And all the regions that are stretched between; The triple worlds sink down, O mighty One, Before Thine awful manifested Form.

In plain words: Arjuna says Krishna alone fills the earth, the sky, and all the space in between. When the three worlds see this terrifying form, they tremble with fear.