योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-26, verse-24

चञ्चत्सपक्षशैलेन्द्रपक्षपातचलद्ध्वनिः ।
कठिनापूरणोद्धूतस्फुटच्छैलेन्द्रकन्दरः ॥ २४ ॥

cañcatsapakṣaśailendrapakṣapātacaladdhvaniḥ ,
kaṭhināpūraṇoddhūtasphuṭacchailendrakandaraḥ 24

24. cañcatsapakṣaśailendrapakṣapātacaladdhvaniḥ
kaṭhināpūraṇoddhūtasphuṭacchailendrakandaraḥ

24. cañcatsapakṣaśailendrapakṣapātacaladdhvaniḥ
kaṭhināpūraṇoddhūtasphuṭacchailendrakandaraḥ

24. He whose sound was a trembling roar, arising from the movement caused by the falling wings of soaring, winged great mountains, and whose great mountain caves were split open, agitated by the intense reverberation.

Words meanings summery:

• चञ्चत्सपक्षशैलेन्द्रपक्षपातचलद्ध्वनिः (cañcatsapakṣaśailendrapakṣapātacaladdhvaniḥ) - Describing a powerful entity or event in a battle context. (One whose sound trembles and moves due to the falling wings of the trembling, winged great mountains.)

• कठिनापूरणोद्धूतस्फुटच्छैलेन्द्रकन्दरः (kaṭhināpūraṇoddhūtasphuṭacchailendrakandaraḥ) - Describing a powerful entity or event in a battle context. (One whose great mountain caves burst open, stirred up by intense reverberation/filling.)

Words meanings and morphology

चञ्चत्सपक्षशैलेन्द्रपक्षपातचलद्ध्वनिः (cañcatsapakṣaśailendrapakṣapātacaladdhvaniḥ) - Describing a powerful entity or event in a battle context. (One whose sound trembles and moves due to the falling wings of the trembling, winged great mountains.)

(adjective)

Nominative, masculine, singular of cañcatsapakṣaśailendrapakṣapātacaladdhvani

cañcatsapakṣaśailendrapakṣapātacaladdhvani - Having a sound that trembles and moves due to the falling wings of the trembling, winged great mountains.

Bahuvrihi compound.

Compound type : Bahuvrīhi (cañcat+sapakṣa+śailendra+pakṣapāta+calat+dhvani)

• cañcat – trembling, quivering, moving to and fro, soaring.
  adjective
  Present Active Participle
  Derived from √cañc (class 1, "to jump, to quiver").
  Root: √cañc (class 1)
• sapakṣa – winged, having wings, allied, partisan.
  adjective
  Preposition sa (with) + pakṣa (wing).
  Prefix: sa
• śailendra – lord of mountains, great mountain, Himalaya.
  noun (masculine)
  Tatpurusha compound: śaila (mountain) + indra (lord).
• pakṣapāta – falling of wings, partiality, bias.
  noun (masculine)
  Compound: pakṣa (wing) + pāta (fall).
• calat – moving, shaking, trembling.
  adjective
  Present Active Participle
  Derived from √cal (class 1, "to move").
  Root: √cal (class 1)
• dhvani – sound, noise, roar, echo.
  noun (masculine)
  Derived from √dhvan (class 1, "to sound").
  Root: √dhvan (class 1)

Note: Describes a powerful being or phenomenon.

कठिनापूरणोद्धूतस्फुटच्छैलेन्द्रकन्दरः (kaṭhināpūraṇoddhūtasphuṭacchailendrakandaraḥ) - Describing a powerful entity or event in a battle context. (One whose great mountain caves burst open, stirred up by intense reverberation/filling.)

(adjective)

Nominative, masculine, singular of kaṭhināpūraṇoddhūtasphuṭacchailendrakandara

kaṭhināpūraṇoddhūtasphuṭacchailendrakandara - Having mountain caves that burst open, stirred up by hard filling/reverberation.

Bahuvrihi compound.

Compound type : Bahuvrīhi (kaṭhina+āpūraṇa+uddhūta+sphuṭat+śailendra+kandara)

• kaṭhina – hard, severe, difficult, intense.
  adjective
• āpūraṇa – filling, overflowing, completing, reverberation.
  noun (neuter)
  Derived from ā + √pṝ (to fill).
  Prefix: ā
  Root: √pṝ (class 9)
• uddhūta – stirred up, shaken, agitated, tossed.
  adjective
  Past Passive Participle
  Derived from ud + √dhū (to shake).
  Prefix: ud
  Root: √dhū (class 5)
• sphuṭat – bursting, splitting, blossoming.
  adjective
  Present Active Participle
  Derived from √sphuṭ (class 1, "to burst").
  Root: √sphuṭ (class 1)
• śailendra – lord of mountains, great mountain, Himalaya.
  noun (masculine)
  Tatpurusha compound: śaila (mountain) + indra (lord).
• kandara – cave, grotto.
  noun (neuter)

Note: Continues the description of the powerful being or phenomenon.