योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-37, verse-51

तावत्तारारवं रेजे सैन्यकाननमुत्तमम् ।
यावन्न परपक्षेण प्राप्तं कल्पानलार्चिषा ॥ ५१ ॥

tāvattārāravaṃ reje sainyakānanamuttamam ,
yāvanna parapakṣeṇa prāptaṃ kalpānalārciṣā 51

51. tāvat tārāravam reje sainyakānanam uttamam
yāvat na parapakṣeṇa prāptam kalpānalārciṣā

51. uttamam sainyakānanam tārāravam reje yāvat
na parapakṣeṇa kalpānalārciṣā prāptam

51. The excellent army, resembling a forest, resounded with a mighty roar. This continued until it was approached by the enemy's forces, which were like the devastating flames of the cosmic dissolution (kalpānala).

Words meanings summery:

• तावत् (tāvat) - so long, so much, until then, thus much

• तारारवम् (tārāravam) - a loud roar, mighty sound

• रेजे (reje) - shone, was splendid, resounded, was adorned

• सैन्यकाननम् (sainyakānanam) - army-forest (an army likened to a dense forest)

• उत्तमम् (uttamam) - excellent, best, supreme, highest

• यावत् (yāvat) - as long as, until, as far as, whenever

• न (na) - not, no

• परपक्षेण (parapakṣeṇa) - by the enemy's side, by the opposing party/faction

• प्राप्तम् (prāptam) - reached, attained, obtained

• कल्पानलार्चिषा (kalpānalārciṣā) - by the flame of the fire of cosmic dissolution

Words meanings and morphology

तावत् (tāvat) - so long, so much, until then, thus much

(indeclinable)

तारारवम् (tārāravam) - a loud roar, mighty sound

(noun)

Nominative, neuter, singular of tārārava

tārārava - loud sound, high-pitched roar

Compound type : tatpurusha (tāra+ārava)

• tāra – loud, high-pitched, shrill
  adjective (masculine)
• ārava – roar, cry, sound, noise
  noun (masculine/neuter)
  Prefix: ā
  Root: ru (class 2)

रेजे (reje) - shone, was splendid, resounded, was adorned

(verb)

3rd person , singular, active, perfect (lit) of rāj

Root: rāj (class 1)

सैन्यकाननम् (sainyakānanam) - army-forest (an army likened to a dense forest)

(noun)

Nominative, neuter, singular of sainyakānana

sainyakānana - army-forest, a dense array of troops

Compound type : karmadhāraya (sainya+kānana)

• sainya – army, military force, host
  noun (neuter)
• kānana – forest, grove, wilderness
  noun (neuter)

उत्तमम् (uttamam) - excellent, best, supreme, highest

(adjective)

Nominative, neuter, singular of uttama

uttama - highest, best, excellent, chief

यावत् (yāvat) - as long as, until, as far as, whenever

(indeclinable)

न (na) - not, no

(indeclinable)

परपक्षेण (parapakṣeṇa) - by the enemy's side, by the opposing party/faction

(noun)

Instrumental, masculine, singular of parapakṣa

parapakṣa - the enemy's side, opposing party, foe

Compound type : tatpurusha (para+pakṣa)

• para – other, hostile, enemy
  adjective
• pakṣa – side, party, wing, faction
  noun (masculine)

प्राप्तम् (prāptam) - reached, attained, obtained

(adjective)

Nominative, neuter, singular of prāpta

prāpta - obtained, reached, gained, arrived

Past Passive Participle

from pra-āp (to obtain, reach)

Prefix: pra

Root: āp (class 5)

कल्पानलार्चिषा (kalpānalārciṣā) - by the flame of the fire of cosmic dissolution

(noun)

Instrumental, feminine, singular of kalpānalārciṣ

kalpānalārciṣ - flame of the destructive fire at the end of a kalpa

Compound type : tatpurusha (kalpa+anala+arciṣ)

• kalpa – a cosmic age, period of creation and dissolution
  noun (masculine/neuter)
• anala – fire
  noun (masculine)
• arciṣ – flame, ray, light
  noun (feminine/neuter)