महाभारतः mahābhārataḥ - book-9, chapter-61, verse-11

अथ पश्चात्ततः कृष्णो रश्मीनुत्सृज्य वाजिनाम् ।
अवारोहत मेधावी रथाद्गाण्डीवधन्वनः ॥११॥

11. atha paścāttataḥ kṛṣṇo raśmīnutsṛjya vājinām ,
avārohata medhāvī rathādgāṇḍīvadhanvanaḥ.

11. atha paścāt tataḥ kṛṣṇaḥ raśmīn utsṛjya vājinām
| avārohata medhāvī rathāt gāṇḍīvadhanvanaḥ

11. atha paścāt tataḥ medhāvī kṛṣṇaḥ vājinām raśmīn
utsṛjya gāṇḍīvadhanvanaḥ rathāt avārohata

11. Then, after that, the intelligent Kṛṣṇa, releasing the reins of the horses, descended from the chariot of the wielder of Gāṇḍīva (Arjuna).

Words meanings summery:

• अथ (atha) - then, next

• पश्चात् (paścāt) - afterwards, from behind

• ततः (tataḥ) - from there, then, afterwards

• कृष्णः (kṛṣṇaḥ) - Kṛṣṇa

• रश्मीन् (raśmīn) - Referring to the reins of the horses. (reins, rays (plural))

• उत्सृज्य (utsṛjya) - having released, letting go

• वाजिनाम् (vājinām) - of the horses

• अवारोहत (avārohata) - descended, alighted

• मेधावी (medhāvī) - Referring to Kṛṣṇa. (intelligent, wise (masculine singular nominative))

• रथात् (rathāt) - from the chariot

• गाण्डीवधन्वनः (gāṇḍīvadhanvanaḥ) - Refers to Arjuna. (of the wielder of Gāṇḍīva (Arjuna))

Words meanings and morphology

अथ (atha) - then, next

(indeclinable)

Adverb of time.

पश्चात् (paścāt) - afterwards, from behind

(indeclinable)

Adverb of time/place.

ततः (tataḥ) - from there, then, afterwards

(indeclinable)

Adverb derived from tad (that).

कृष्णः (kṛṣṇaḥ) - Kṛṣṇa

(proper noun)

Nominative, masculine, singular of kṛṣṇa

kṛṣṇa - Kṛṣṇa (a divine being), black, dark

रश्मीन् (raśmīn) - Referring to the reins of the horses. (reins, rays (plural))

(noun)

Accusative, masculine, plural of raśmi

raśmi - ray (of light), rein, rope, bridle

उत्सृज्य (utsṛjya) - having released, letting go

(indeclinable)

Absolutive (gerund)

Root sṛj with upasarga ut, suffix -ya.

Prefix: ut

Root: sṛj (class 6)

वाजिनाम् (vājinām) - of the horses

(noun)

Genitive, masculine, plural of vājin

vājin - horse, swift, spirited

From vāja (strength, speed).

अवारोहत (avārohata) - descended, alighted

(verb)

3rd person , singular, active, past imperfect (laṅ) of avaroh

Imperfect tense

Root ruh with upasarga ava, augment a-, imperfect 3rd person singular.

Prefix: ava

Root: ruh (class 1)

मेधावी (medhāvī) - Referring to Kṛṣṇa. (intelligent, wise (masculine singular nominative))

(adjective)

Nominative, masculine, singular of medhāvin

medhāvin - intelligent, wise, discerning, possessing intellect

From medhā (intellect) + -vin suffix.

रथात् (rathāt) - from the chariot

(noun)

Ablative, masculine, singular of ratha

ratha - chariot, car

गाण्डीवधन्वनः (gāṇḍīvadhanvanaḥ) - Refers to Arjuna. (of the wielder of Gāṇḍīva (Arjuna))

(proper noun)

Genitive, masculine, singular of gāṇḍīvadhanvan

gāṇḍīvadhanvan - one who has Gāṇḍīva as a bow, wielder of Gāṇḍīva, Arjuna

Compound word.

Compound type : bahuvrīhi (gāṇḍīva+dhanus)

• gāṇḍīva – the name of Arjuna's bow
  proper noun (neuter)
• dhanus – bow, arch
  noun (neuter)