महाभारतः mahābhārataḥ - book-7, chapter-131, verse-90

अथ प्रववृते युद्धं द्रौणिराक्षसयोर्मृधे ।
विभावर्यां सुतुमुलं शक्रप्रह्रादयोरिव ॥९०॥

90. atha pravavṛte yuddhaṁ drauṇirākṣasayormṛdhe ,
vibhāvaryāṁ sutumulaṁ śakraprahrādayoriva.

90. atha pravavṛte yuddham drauṇi rākṣasayoḥ mṛdhe
vibhāvaryām sutumulam śakra prahrādayoḥ iva

90. atha vibhāvaryām mṛdhe drauṇi rākṣasayoḥ śakra
prahrādayoḥ iva sutumulam yuddham pravavṛte

90. Then, a very fierce battle began in the night between Aśvatthāmā (Droṇi) and the Rākṣasa Ghaṭotkaca, just like the one between Indra (Śakra) and Prahlāda.

Words meanings summery:

• अथ (atha) - then, now, thereupon

• प्रववृते (pravavṛte) - began, commenced

• युद्धम् (yuddham) - battle, combat, fight

• द्रौणि (drauṇi) - Aśvatthāmā (Droṇi, son of Droṇa)

• राक्षसयोः (rākṣasayoḥ) - between Ghaṭotkaca and Droṇi (Aśvatthāmā) (of the two Rākṣasas, between the two Rākṣasas)

• मृधे (mṛdhe) - in battle, in combat

• विभावर्याम् (vibhāvaryām) - in the night, during the night

• सुतुमुलम् (sutumulam) - very fierce, extremely tumultuous

• शक्र (śakra) - Indra, the king of gods

• प्रह्रादयोः (prahrādayoḥ) - of Prahlāda, between Prahlāda

• इव (iva) - like, as, as if

Words meanings and morphology

अथ (atha) - then, now, thereupon

(indeclinable)

प्रववृते (pravavṛte) - began, commenced

(verb)

3rd person , singular, middle, perfect (liṭ) of pravṛt

Perfect, Ātmanepada, 3rd Person Singular

Derived from root vṛt (class 1, 'to be, to exist, to turn, to proceed') with upasarga pra-.

Prefix: pra

Root: vṛt (class 1)

युद्धम् (yuddham) - battle, combat, fight

(noun)

Nominative, neuter, singular of yuddha

yuddha - battle, fight, war

From root yudh 'to fight'.

Root: yudh (class 4)

Note: Can also be accusative singular. Here, it is the subject of 'pravavṛte'.

द्रौणि (drauṇi) - Aśvatthāmā (Droṇi, son of Droṇa)

(proper noun)

masculine, singular of drauṇi

drauṇi - son of Droṇa, Aśvatthāmā

Patronymic from Droṇa.

Note: Part of a dvandva compound `drauṇi-rākṣasayoḥ`. This is the stem form for the compound.

राक्षसयोः (rākṣasayoḥ) - between Ghaṭotkaca and Droṇi (Aśvatthāmā) (of the two Rākṣasas, between the two Rākṣasas)

(noun)

Genitive, masculine, dual of rākṣasa

rākṣasa - a Rākṣasa, demon

Derived from rakṣas.

Note: Forms a dvandva compound with 'drauṇi'. The original is 'drauṇi-rākṣasa-yoḥ'.

मृधे (mṛdhe) - in battle, in combat

(noun)

Locative, feminine, singular of mṛdh

mṛdh - battle, combat, strife

विभावर्याम् (vibhāvaryām) - in the night, during the night

(noun)

Locative, feminine, singular of vibhāvarī

vibhāvarī - night, the brilliant one

Feminine of vibhāvara (shining, brilliant), meaning 'night' as the time for brilliance (stars, moon).

सुतुमुलम् (sutumulam) - very fierce, extremely tumultuous

(adjective)

Nominative, neuter, singular of sutumula

sutumula - very tumultuous, very fierce, greatly agitated

Compound of su- (intensifier) and tumula (tumultuous).

Compound type : karmadhāraya (su+tumula)

• su – good, well, very, excellent
  indeclinable
• tumula – tumultuous, noisy, agitated, terrible
  adjective

Note: Can also be accusative singular. Agrees with yuddham.

शक्र (śakra) - Indra, the king of gods

(proper noun)

masculine, singular of śakra

śakra - Indra, powerful one

Note: Part of a dvandva compound `śakra-prahrādayoḥ`. This is the stem form for the compound.

प्रह्रादयोः (prahrādayoḥ) - of Prahlāda, between Prahlāda

(proper noun)

Genitive, masculine, dual of prahrāda

prahrāda - Prahlāda (a famous Asura king, devotee of Viṣṇu)

Note: Forms a dvandva compound with 'śakra'. The original is 'śakra-prahrāda-yoḥ'.

इव (iva) - like, as, as if

(indeclinable)