योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-26, verse-51

फुल्लैककिंशुकवनं कुर्वद्दुर्वारवैरतः ।
पर्वतप्रतिमासंख्यं शवपूर्णमहार्णवम् ॥ ५१ ॥

phullaikakiṃśukavanaṃ kurvaddurvāravairataḥ ,
parvatapratimāsaṃkhyaṃ śavapūrṇamahārṇavam 51

51. phullaika-kiṃśukavanam kurvat durvāravairataḥ
parvatapratimāsaṃkhyam śavapūrṇamahārṇavam

51. (saḥ) durvāravairataḥ phullaika-kiṃśukavanam
kurvat parvatapratimāsaṃkhyam śavapūrṇamahārṇavam

51. Describing the demon, who is transforming the battlefield into a forest of fully bloomed kiṃśuka trees (red from carnage) through irresistible hostility, and creating a great ocean filled with corpses as numerous as mountains.

Words meanings summery:

• फुल्लैक-किंशुकवनम् (phullaika-kiṁśukavanam) - the battlefield transformed into a blood-red forest of kiṃśuka trees (a forest of single blooming kiṃśuka trees)

• कुर्वत् (kurvat) - causing (the battlefield to become) (making, doing, causing)

• दुर्वारवैरतः (durvāravairataḥ) - due to his unconquerable enmity (from irresistible hostility/enmity)

• पर्वतप्रतिमासंख्यम् (parvatapratimāsaṁkhyam) - (corpses) as numerous as mountains (whose number is comparable to mountains, as numerous as mountains)

• शवपूर्णमहार्णवम् (śavapūrṇamahārṇavam) - the great ocean filled with countless corpses (a great ocean full of corpses)

Words meanings and morphology

फुल्लैक-किंशुकवनम् (phullaika-kiṁśukavanam) - the battlefield transformed into a blood-red forest of kiṃśuka trees (a forest of single blooming kiṃśuka trees)

(noun)

Accusative, neuter, singular of phullaika-kiṃśukavana

phullaika-kiṁśukavana - a forest of blooming kiṃśuka trees

Compound describing a forest, with kiṃśuka trees, which are blooming. 'Eka' for emphasis on individual trees or for singular/unique.

Compound type : Tatpurusha (phulla+eka+kiṃśuka+vana)

• phulla – bloomed, open, expanded
  adjective
  Past Passive Participle
  From root phull (to blossom).
  Root: phull (class 1)
• eka – one, single, unique
  numeral / adjective
• kiṃśuka – Butea monosperma (palasha tree), whose flowers are bright red
  noun (masculine)
• vana – forest, grove, wood
  noun (neuter)
  Root: van (class 1)

Note: Object of the participle 'kurvat'.

कुर्वत् (kurvat) - causing (the battlefield to become) (making, doing, causing)

(adjective)

Nominative, masculine, singular of kurvat

kurvat - making, doing

Present Active Participle

Present active participle of root kṛ (to do, make).

Root: kṛ (class 8)

Note: Participle describing the action of the implied subject (the demon).

दुर्वारवैरतः (durvāravairataḥ) - due to his unconquerable enmity (from irresistible hostility/enmity)

(noun)

Ablative, neuter, singular of durvāravaira

durvāravaira - irresistible hostility

Compound of durvāra (irresistible) and vaira (hostility).

Compound type : Karmadharaya (durvāra+vaira)

• durvāra – irresistible, unconquerable, difficult to restrain
  adjective
  Compound of dur (difficult) and vāra (restraining).
  Prefix: dur
  Root: vṛ (class 5)
• vaira – enmity, hostility, hatred
  noun (neuter)
  Derived from vīra (hero), implying hostility between powerful individuals.
  Root: vīr

Note: Indicates the cause or instrument of the action.

पर्वतप्रतिमासंख्यम् (parvatapratimāsaṁkhyam) - (corpses) as numerous as mountains (whose number is comparable to mountains, as numerous as mountains)

(adjective)

Accusative, masculine, singular of parvatapratimāsaṃkhya

parvatapratimāsaṁkhya - comparable in number to mountains

Compound of parvata (mountain), pratimā (likeness), and saṃkhya (number).

Compound type : Bahuvrihi (parvata+pratimā+saṃkhya)

• parvata – mountain
  noun (masculine)
• pratimā – likeness, image, comparison
  noun (feminine)
  Derived from prati-mā (to measure against).
  Prefix: prati
  Root: mā (class 2)
• saṃkhya – number, count, multitude, comparable to
  noun (neuter)
  Derived from sam-khyā (to count, compute).
  Prefix: sam
  Root: khyā (class 2)

Note: Adjective modifying 'śavapūrṇamahārṇavam' or an implied object like 'śavān'.

शवपूर्णमहार्णवम् (śavapūrṇamahārṇavam) - the great ocean filled with countless corpses (a great ocean full of corpses)

(noun)

Accusative, masculine, singular of śavapūrṇamahārṇava

śavapūrṇamahārṇava - a great ocean filled with corpses

Bahuvrihi compound, describing something that has an ocean filled with corpses. Metaphor for immense slaughter.

Compound type : Bahuvrihi (śava+pūrṇa+mahārṇava)

• śava – corpse, dead body
  noun (masculine)
  Root: śū
• pūrṇa – full, complete, filled with
  adjective
  Past Passive Participle
  From root pṛ (to fill).
  Root: pṛ (class 9)
• mahārṇava – great ocean
  noun (masculine)

Note: Object of the participle 'kurvat'.