योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-77, verse-4

उच्छलद्दीर्घरुत्कारैश्छमच्छममयात्मकैः ।
तूर्यमुन्नमदासारविसारिजयघोषणम् ॥ ४ ॥

ucchaladdīrgharutkāraiśchamacchamamayātmakaiḥ ,
tūryamunnamadāsāravisārijayaghoṣaṇam 4

4. ucchalat-dīrgha-rutkāraiḥ chamacchama-mayātmakaiḥ
tūryam unnamat-āsāra-visāri-jaya-ghoṣaṇam

4. ucchalat-dīrgha-rutkāraiḥ chamacchama-mayātmakaiḥ
ca tūryam unnamat-āsāra-visāri-jaya-ghoṣaṇam

4. (The three worlds were accompanied) by surging, deep roars composed of crashing sounds, and (were like) a tremendous trumpeting (tūrya) of victory whose spreading proclamations rose up like an incessant downpour.

Words meanings summery:

• उच्छलत्-दीर्घ-रुत्कारैः (ucchalat-dīrgha-rutkāraiḥ) - Describing the loud, intense sounds of destruction accompanying the cosmic dissolution. (with surging, deep roars)

• छमच्छम-मयात्मकैः (chamacchama-mayātmakaiḥ) - The specific quality of the deep roars, emphasizing their noisy and destructive nature. (consisting of crashing/rustling sounds)

• तूर्यम् (tūryam) - Metaphorically refers to the sound of destruction being like a grand, ominous trumpet. (a musical instrument, trumpet, horn)

• उन्नमत्-आसार-विसारि-जय-घोषणम् (unnamat-āsāra-visāri-jaya-ghoṣaṇam) - Describes the sound of cosmic destruction as a triumphant, all-encompassing roar of victory. (a proclamation of victory that rises, pours forth, and spreads)

Words meanings and morphology

उच्छलत्-दीर्घ-रुत्कारैः (ucchalat-dīrgha-rutkāraiḥ) - Describing the loud, intense sounds of destruction accompanying the cosmic dissolution. (with surging, deep roars)

(noun)

Instrumental, masculine, plural of ucchalat-dīrgha-rutkāra

ucchalat-dīrgha-rutkāra - (that which has) surging long roars

Compound noun, instrumental plural.

Compound type : karmadhāraya (ucchalat+dīrgha+rutkāra)

• ucchalat – surging up, gushing forth, leaping up
  adjective (masculine)
  Present Active Participle
  Derived from `ud-` + `chal` (to move, to go).
  Prefix: ud
  Root: chal (class 1)
• dīrgha – long, deep, extensive
  adjective (masculine)
• rutkāra – roar, cry, sound
  noun (masculine)
  Compound of `rut` (sound) + `kāra` (making).
  Root: ru (class 2)

Note: Describes the means or accompaniment of the described state.

छमच्छम-मयात्मकैः (chamacchama-mayātmakaiḥ) - The specific quality of the deep roars, emphasizing their noisy and destructive nature. (consisting of crashing/rustling sounds)

(adjective)

Instrumental, masculine, plural of chamacchama-mayātmaka

chamacchama-mayātmaka - consisting of crashing/rustling sounds; having the nature of 'chamacchama'

Compound adjective, instrumental plural.

Compound type : tatpuruṣa (chamacchama+maya+ātmaka)

• chamacchama – a crashing, rustling, clashing sound (onomatopoeic)
  indeclinable
  Reduplicative onomatopoeic word.
• maya – made of, consisting of, full of
  suffix (masculine)
  A taddhita suffix forming adjectives meaning 'made of' or 'consisting of'. Used here adjectivally within the compound.
• ātmaka – having the nature of, consisting of, essential
  adjective (masculine)
  Derived from `ātman` (self, essence) + `ka` suffix.

Note: Agrees with `rutkāraiḥ`.

तूर्यम् (tūryam) - Metaphorically refers to the sound of destruction being like a grand, ominous trumpet. (a musical instrument, trumpet, horn)

(noun)

neuter, singular of tūrya

tūrya - a musical instrument, wind instrument, trumpet, horn

Note: Serves as the nominal core of the final descriptive phrase.

उन्नमत्-आसार-विसारि-जय-घोषणम् (unnamat-āsāra-visāri-jaya-ghoṣaṇam) - Describes the sound of cosmic destruction as a triumphant, all-encompassing roar of victory. (a proclamation of victory that rises, pours forth, and spreads)

(adjective)

neuter, singular of unnamat-āsāra-visāri-jaya-ghoṣaṇa

unnamat-āsāra-visāri-jaya-ghoṣaṇa - (a proclamation of victory that is) rising, flowing like a shower, and spreading

Compound adjective, modifying `tūryam`.

Compound type : karmadhāraya (unnamat+āsāra+visāri+jaya-ghoṣaṇa)

• unnamat – rising up, elevating, becoming prominent
  adjective (neuter)
  Present Active Participle
  Derived from `ud-` + `nam` (to bend, rise).
  Prefix: ud
  Root: nam (class 1)
• āsāra – continuous shower, downpour, heavy rain
  noun (masculine)
  Derived from `ā-` + `sṛ` (to flow).
  Prefix: ā
  Root: sṛ (class 1)
• visāri – spreading, diffusing, extending
  adjective (neuter)
  Present Active Participle
  Derived from `vi-` + `sṛ` (to flow, spread).
  Prefix: vi
  Root: sṛ (class 1)
• jaya-ghoṣaṇa – proclamation of victory, shout of triumph
  noun (neuter)
  Compound of `jaya` (victory) + `ghoṣaṇa` (proclamation).

Note: Describes `tūryam`.