योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-88, verse-17

शृङ्गमन्दिरमातङ्गप्रहाराशनिभूरुहाम् ।
निबिडाङ्गोत्कटस्थैर्यपरुषापतनं क्वचित् ॥ १७ ॥

śṛṅgamandiramātaṅgaprahārāśanibhūruhām ,
nibiḍāṅgotkaṭasthairyaparuṣāpatanaṃ kvacit 17

17. śṛṅgamandiramātaṅgaprahārāśanibhūruhām
nibiḍāṅgotkaṭasthairyaparuṣāpatanam kvacit

17. kvacit nibiḍāṅgotkaṭasthairyaparuṣāpatanam
śṛṅgamandiramātaṅgaprahārāśanibhūruhām

17. Sometimes, there is a harsh impact, dense in its parts and extremely firm, resembling the striking force of peaks, temples, elephant-blows, thunderbolts, and trees.

Words meanings summery:

• शृङ्गमन्दिरमातङ्गप्रहाराशनिभूरुहाम् (śṛṅgamandiramātaṅgaprahārāśanibhūruhām) - of peaks, temples, elephant-blows, thunderbolts, and trees

• निबिडाङ्गोत्कटस्थैर्यपरुषापतनम् (nibiḍāṅgotkaṭasthairyaparuṣāpatanam) - a dense-bodied, intensely firm, harsh impact/falling

• क्वचित् (kvacit) - sometimes, in some place, somewhere

Words meanings and morphology

शृङ्गमन्दिरमातङ्गप्रहाराशनिभूरुहाम् (śṛṅgamandiramātaṅgaprahārāśanibhūruhām) - of peaks, temples, elephant-blows, thunderbolts, and trees

(noun)

Genitive, plural of śṛṅgamandiramātaṅgaprahārāśanibhūruha

śṛṅgamandiramātaṅgaprahārāśanibhūruha - peaks, temples, elephant-blows, thunderbolts, and trees (as elements of a destructive force)

Compound type : Dvandva (śṛṅga+mandira+mātaṅgaprahāra+aśani+bhūruha)

• śṛṅga – horn, peak, summit
  noun (neuter)
• mandira – temple, house, dwelling
  noun (neuter)
• mātaṅgaprahāra – elephant-blow/strike
  noun (masculine)
  Prefix: pra
  Root: hṛ (class 1)
• aśani – thunderbolt, lightning
  noun (masculine)
• bhūruha – tree (literally 'earth-grower')
  noun (masculine)
  Derived from 'bhū' (earth) and 'ruh' (to grow).
  Root: ruh (class 1)

Note: Genitive plural, indicating 'of these' or 'like these'.

निबिडाङ्गोत्कटस्थैर्यपरुषापतनम् (nibiḍāṅgotkaṭasthairyaparuṣāpatanam) - a dense-bodied, intensely firm, harsh impact/falling

(noun)

Nominative, neuter, singular of nibiḍāṅgotkaṭasthairyaparuṣāpatana

nibiḍāṅgotkaṭasthairyaparuṣāpatana - a falling or impact that is dense in its components, extremely firm, and harsh

Compound type : Karmadhāraya (nibiḍāṅga+utkaṭasthairya+paruṣa+āpatana)

• nibiḍāṅga – dense-bodied, with dense parts
  adjective (neuter)
• utkaṭasthairya – intensely firm, of extreme stability
  adjective (neuter)
• paruṣa – harsh, rough, violent, severe
  adjective (neuter)
• āpatana – falling, descending, attacking, impact
  noun (neuter)
  Derived from root 'pat' (to fall) with prefix 'ā'.
  Prefix: ā
  Root: pat (class 1)

Note: Nominative singular, serving as the subject or predicate.

क्वचित् (kvacit) - sometimes, in some place, somewhere

(indeclinable)