योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-38, verse-30

उत्ताल्वर्धमृतेभाश्ववार्यमाणाल्पजीवितम् ।
वहद्रक्तनदीवीचिप्रहारहतदुन्दुभि ॥ ३० ॥

uttālvardhamṛtebhāśvavāryamāṇālpajīvitam ,
vahadraktanadīvīciprahārahatadundubhi 30

30. uttālvardhamṛtebhāśvavāryamāṇālpajīvitam
vahat raktanadīvīciprahārahatadundubhi

30. uttālvardhamṛtebhāśvavāryamāṇālpajīvitam
vahat raktanadīvīciprahārahatadundubhi

30. Where the barely surviving lives of mighty, half-dead elephants and horses were being restrained (from expiring), and war drums were silenced by the impact of waves from flowing rivers of blood.

Words meanings summery:

• उत्ताल्वर्धमृतेभाश्ववार्यमाणाल्पजीवितम् (uttālvardhamṛtebhāśvavāryamāṇālpajīvitam) - where the barely surviving lives of mighty, half-dead elephants and horses were being restrained (from expiring)

• वहत् रक्तनदीवीचिप्रहारहतदुन्दुभि (vahat raktanadīvīciprahārahatadundubhi) - where war drums were silenced by the impact of waves from flowing rivers of blood

Words meanings and morphology

उत्ताल्वर्धमृतेभाश्ववार्यमाणाल्पजीवितम् (uttālvardhamṛtebhāśvavāryamāṇālpajīvitam) - where the barely surviving lives of mighty, half-dead elephants and horses were being restrained (from expiring)

(adjective)

Accusative, neuter, singular of uttālvardhamṛtebhāśvavāryamāṇālpajīvita

uttālvardhamṛtebhāśvavāryamāṇālpajīvita - having the meager life of mighty, half-dead elephants and horses being held back (from death)

Compound type : bahuvrīhi (uttālva+ardhamṛta+ibha+aśva+vāryamāṇa+alpajīvita)

• uttālva – mighty, fierce, formidable, lofty
  adjective (masculine)
• ardhamṛta – half-dead, severely wounded
  adjective (neuter)
  Compound of 'ardha' (half) and 'mṛta' (dead).
• ibha – elephant
  noun (masculine)
• aśva – horse
  noun (masculine)
• vāryamāṇa – being held back, being restrained, being prevented
  adjective (neuter)
  Present Passive Participle
  Derived from root 'vṛ' (to restrain, hold back), class 5.
  Root: vṛ (class 5)
• alpajīvita – meager life, barely living
  noun (neuter)
  Compound of 'alpa' (little) and 'jīvita' (life).

Note: Adjective modifying an implied neuter noun like 'kṣetram' (battlefield).

वहत् रक्तनदीवीचिप्रहारहतदुन्दुभि (vahat raktanadīvīciprahārahatadundubhi) - where war drums were silenced by the impact of waves from flowing rivers of blood

(adjective)

Accusative, masculine, singular of vahatrakta-nadīvīci-prahāra-hata-dundubhi

vahatrakta-nadīvīci-prahāra-hata-dundubhi - having war-drums silenced by the strikes of waves of flowing blood-rivers

Compound type : bahuvrīhi (vahat+rakta+nadī+vīci+prahāra+hata+dundubhi)

• vahat – flowing, carrying, bearing
  adjective (masculine)
  Present Active Participle
  Derived from root 'vah' (to carry, flow), class 1.
  Root: vah (class 1)
• rakta – blood, red, colored
  noun (neuter)
• nadī – river
  noun (feminine)
• vīci – wave, billow, ray, multitude
  noun (feminine)
• prahāra – strike, blow, assault
  noun (masculine)
  Prefix: pra
• hata – struck, killed, destroyed, silenced
  adjective (masculine)
  Past Passive Participle
  Derived from root 'han' (to strike, kill), class 2.
  Root: han (class 2)
• dundubhi – war drum, kettle drum
  noun (masculine)

Note: The compound acts as an adjective. Although the preceding adjectives end in neuter accusative 'm', this one ends in 'i' as per the noun 'dundubhi'. This may imply a masculine implied noun or a flexible adjectival ending, but for consistency with the overall description of the battlefield, it is assumed to be accusative.