महाभारतः mahābhārataḥ - book-8, chapter-58, verse-7

धनंजयशराभ्यस्तैः स्यन्दनाश्वनरद्विपैः ।
रणभूमिरभूद्राजन्महावैतरणी यथा ॥७॥

7. dhanaṁjayaśarābhyastaiḥ syandanāśvanaradvipaiḥ ,
raṇabhūmirabhūdrājanmahāvaitaraṇī yathā.

7. dhanañjaya-śara-abhyastaiḥ syandana-aśva-nara-dvipaiḥ
raṇabhūmiḥ abhūt rājan mahā-vaitaraṇī yathā

7. rājan dhanañjaya-śara-abhyastaiḥ syandana-aśva-nara-dvipaiḥ
raṇabhūmiḥ mahā-vaitaraṇī yathā abhūt

7. O King, the battlefield became like the great river Vaitaraṇī, filled with chariots, horses, men, and elephants assailed by Arjuna's (dhanañjaya) arrows.

Words meanings summery:

• धनञ्जय-शर-अभ्यस्तैः (dhanañjaya-śara-abhyastaiḥ) - by those assailed by Arjuna's arrows

• स्यन्दन-अश्व-नर-द्विपैः (syandana-aśva-nara-dvipaiḥ) - by chariots, horses, men, and elephants

• रणभूमिः (raṇabhūmiḥ) - the battlefield, the field of battle

• अभूत् (abhūt) - became, was

• राजन् (rājan) - O king

• महा-वैतरणी (mahā-vaitaraṇī) - the great Vaitaraṇī (river of hell)

• यथा (yathā) - as, like, in the manner that

Words meanings and morphology

धनञ्जय-शर-अभ्यस्तैः (dhanañjaya-śara-abhyastaiḥ) - by those assailed by Arjuna's arrows

(adjective)

Instrumental, masculine, plural of dhanañjaya-śara-abhyasta

dhanañjaya-śara-abhyasta - assailed or struck by the arrows of Arjuna

Compound type : Tatpuruṣa (dhanañjaya-śara+abhyasta)

• dhanañjaya-śara – Arjuna's arrow
  noun (masculine)
• dhanañjaya – Arjuna (conqueror of wealth)
  proper noun (masculine)
• śara – arrow
  noun (masculine)
• abhyasta – struck, assailed, practised
  participle
  Past Passive Participle
  Derived from root √as (to throw, cast) with prefix abhi-.
  Prefix: abhi
  Root: as (class 4)

Note: Qualifies 'syandana-aśva-nara-dvipaiḥ'.

स्यन्दन-अश्व-नर-द्विपैः (syandana-aśva-nara-dvipaiḥ) - by chariots, horses, men, and elephants

(noun)

Instrumental, masculine, plural of syandana-aśva-nara-dvipa

syandana-aśva-nara-dvipa - chariots, horses, men, and elephants (collectively)

Compound type : Dvandva (syandana+aśva+nara+dvipa)

• syandana – chariot, car
  noun (neuter)
  Derived from root √syand (to move, flow).
  Root: syand (class 1)
• aśva – horse
  noun (masculine)
• nara – man, person
  noun (masculine)
• dvipa – elephant (lit. 'two-drinker', referring to its trunk and mouth)
  noun (masculine)
  Compound 'dvi-pa' (two-drinker).

रणभूमिः (raṇabhūmiḥ) - the battlefield, the field of battle

(noun)

Nominative, feminine, singular of raṇabhūmi

raṇabhūmi - battlefield, ground for war

Compound type : Tatpuruṣa (raṇa+bhūmi)

• raṇa – battle, war, fight
  noun (masculine)
  Root: raṇ (class 1)
• bhūmi – earth, ground, land
  noun (feminine)

अभूत् (abhūt) - became, was

(verb)

3rd person , singular, active, aorist (Luṅ) of bhū

Root: bhū (class 1)

राजन् (rājan) - O king

(noun)

Vocative, masculine, singular of rājan

rājan - king, sovereign

महा-वैतरणी (mahā-vaitaraṇī) - the great Vaitaraṇī (river of hell)

(proper noun)

Nominative, feminine, singular of mahā-vaitaraṇī

mahā-vaitaraṇī - the great Vaitaraṇī river (a mythical river of hell)

Compound type : Karmadhāraya (mahā+vaitaraṇī)

• mahā – great, mighty, large
  adjective
• vaitaraṇī – the river Vaitaraṇī (a mythical river that separates the living world from the realm of the dead)
  proper noun (feminine)

यथा (yathā) - as, like, in the manner that

(indeclinable)