योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-77, verse-6

ब्रह्माण्डभित्तिभांकारभीषणैर्मातरिश्वनः ।
प्रसरैरम्बरोड्डीनदग्धेन्द्रादिपुरोत्करम् ॥ ६ ॥

brahmāṇḍabhittibhāṃkārabhīṣaṇairmātariśvanaḥ ,
prasarairambaroḍḍīnadagdhendrādipurotkaram 6

6. brahmāṇḍabhittibhāṃkārabhīṣaṇaiḥ mātariśvanaḥ
prasaraiḥ ambaraudḍīnadagdhendrādipurotkaram

6. mātariśvanaḥ brahmāṇḍabhittibhāṃkārabhīṣaṇaiḥ
prasaraiḥ ambaraudḍīnadagdhendrādipurotkaram

6. By the terrifying expansions of the wind (mātariśvan), which created a roaring sound against the walls of the cosmic egg (brahmāṇḍa), the multitudes of cities belonging to Indra and other gods were burnt after being swept up into the sky.

Words meanings summery:

• ब्रह्माण्डभित्तिभांकारभीषणैः (brahmāṇḍabhittibhāṁkārabhīṣaṇaiḥ) - terrifying with the roaring sound on the walls of the cosmic egg

• मातरिश्वनः (mātariśvanaḥ) - of the wind, of Vayu

• प्रसरैः (prasaraiḥ) - by the expansions, by the movements, by the courses

• अम्बरौद्डीनदग्धेन्द्रादिपुरोत्करम् (ambaraudḍīnadagdhendrādipurotkaram) - a multitude of cities, like those of Indra and others, burnt after being swept up into the sky

Words meanings and morphology

ब्रह्माण्डभित्तिभांकारभीषणैः (brahmāṇḍabhittibhāṁkārabhīṣaṇaiḥ) - terrifying with the roaring sound on the walls of the cosmic egg

(adjective)

Instrumental, masculine, plural of brahmāṇḍabhittibhāṃkārabhīṣaṇa

brahmāṇḍabhittibhāṁkārabhīṣaṇa - terrifying with the roaring sound on the walls of the cosmic egg

Compound type : Bahuvrihi (brahmāṇḍa+bhitti+bhāṃkāra+bhīṣaṇa)

• brahmāṇḍa – cosmic egg, universe
  noun (neuter)
• bhitti – wall, partition
  noun (feminine)
• bhāṃkāra – roaring, terrible sound
  noun (masculine)
• bhīṣaṇa – terrifying, dreadful
  adjective

Note: Instrumental plural, modifying prasaraiḥ.

मातरिश्वनः (mātariśvanaḥ) - of the wind, of Vayu

(noun)

Genitive, masculine, singular of mātariśvan

mātariśvan - wind, air, Vayu (as a deity)

Note: Genitive singular, indicating possession or origin.

प्रसरैः (prasaraiḥ) - by the expansions, by the movements, by the courses

(noun)

Instrumental, masculine, plural of prasara

prasara - expansion, course, movement, flow

Prefix: pra

Root: sṛ (class 1)

Note: Instrumental plural, indicating the means or agency.

अम्बरौद्डीनदग्धेन्द्रादिपुरोत्करम् (ambaraudḍīnadagdhendrādipurotkaram) - a multitude of cities, like those of Indra and others, burnt after being swept up into the sky

(noun)

Accusative, neuter, singular of ambaraudḍīnadagdhendrādipurotkara

ambaraudḍīnadagdhendrādipurotkara - a multitude of cities, like those of Indra and others, burnt after being swept up into the sky

Compound type : Bahuvrihi/Tatpurusha (ambara+udḍīna+dagdha+indra+ādi+pura+utkara)

• ambara – sky, atmosphere
  noun (neuter)
• udḍīna – flown up, soaring
  participle
  Past Passive Participle
  Derived from √ḍī (to fly) with ud- prefix.
  Prefix: ud
  Root: ḍī (class 4)
• dagdha – burnt, consumed by fire
  participle
  Past Passive Participle
  Derived from √dah (to burn).
  Root: dah (class 1)
• indra – Indra (name of a deity)
  proper noun (masculine)
• ādi – beginning, and so forth, etc.
  indeclinable
• pura – city, fortress
  noun (neuter)
• utkara – multitude, heap, mass
  noun (masculine)

Note: Accusative singular, acting as the direct object or a predicate accusative.