महाभारतः mahābhārataḥ - book-1, chapter-181, verse-7

ततो वैकर्तनः कर्णो जगामार्जुनमोजसा ।
युद्धार्थी वाशिताहेतोर्गजः प्रतिगजं यथा ॥७॥

7. tato vaikartanaḥ karṇo jagāmārjunamojasā ,
yuddhārthī vāśitāhetorgajaḥ pratigajaṁ yathā.

7. tataḥ vaikartanaḥ karṇaḥ jagāma arjunam ojasā
yuddhārthī vāśitāhetoḥ gajaḥ pratigajam yathā

7. Then, Karṇa, the son of Vikartana, advanced against Arjuna with great might, desiring battle, just as an elephant (gaja), seeking a female in heat (vāśitā), charges against an opposing elephant (gaja).

Words meanings summery:

• ततः (tataḥ) - then, thereupon, from that

• वैकर्तनः (vaikartanaḥ) - son of Vikartana (Sūrya), Karṇa

• कर्णः (karṇaḥ) - Karṇa (proper name)

• जगाम (jagāma) - went, approached, advanced

• अर्जुनम् (arjunam) - Arjuna (proper name)

• ओजसा (ojasā) - with might, by strength, powerfully

• युद्धार्थी (yuddhārthī) - desiring battle, seeking battle

• वाशिताहेतोः (vāśitāhetoḥ) - for the sake of a female elephant in heat

• गजः (gajaḥ) - elephant

• प्रतिगजम् (pratigajam) - against an opposing elephant

• यथा (yathā) - just as, as, according to

Words meanings and morphology

ततः (tataḥ) - then, thereupon, from that

(indeclinable)

वैकर्तनः (vaikartanaḥ) - son of Vikartana (Sūrya), Karṇa

(proper noun)

Nominative, masculine, singular of vaikartana

vaikartana - son of Vikartana (an epithet of the sun god Sūrya, thus Karṇa)

patronymic from Vikartana

कर्णः (karṇaḥ) - Karṇa (proper name)

(proper noun)

Nominative, masculine, singular of karṇa

karṇa - Karṇa (name of a warrior in the Mahābhārata), ear

जगाम (jagāma) - went, approached, advanced

(verb)

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

Perfect

root 'gam'

Root: gam (class 1)

अर्जुनम् (arjunam) - Arjuna (proper name)

(proper noun)

Accusative, masculine, singular of arjuna

arjuna - Arjuna (name of a Pāṇḍava brother), white, clear

ओजसा (ojasā) - with might, by strength, powerfully

(noun)

Instrumental, neuter, singular of ojas

ojas - might, power, strength, vigor

युद्धार्थी (yuddhārthī) - desiring battle, seeking battle

(adjective)

Nominative, masculine, singular of yuddhārthin

yuddhārthin - desiring battle, desirous of war

Compound type : tatpuruṣa (yuddha+arthin)

• yuddha – battle, fight, war
  noun (neuter)
  Root: yudh (class 4)
• arthin – seeker, desirous of, having a purpose
  adjective (masculine)

वाशिताहेतोः (vāśitāhetoḥ) - for the sake of a female elephant in heat

(noun)

Genitive, masculine, singular of vāśitāhetu

vāśitāhetu - reason or cause related to a female elephant in heat

Compound type : tatpuruṣa (vāśitā+hetu)

• vāśitā – female elephant (especially one in heat), roaring, crying
  noun (feminine)
  Root: vāś (class 1)
• hetu – cause, reason, motive, for the sake of
  noun (masculine)
  Root: hi (class 5)

गजः (gajaḥ) - elephant

(noun)

Nominative, masculine, singular of gaja

gaja - elephant

प्रतिगजम् (pratigajam) - against an opposing elephant

(noun)

Accusative, masculine, singular of pratigaja

pratigaja - opposing elephant, rival elephant

Compound type : tatpuruṣa (prati+gaja)

• prati – against, towards, in return
  prefix
• gaja – elephant
  noun (masculine)

यथा (yathā) - just as, as, according to

(indeclinable)