महाभारतः mahābhārataḥ - book-8, chapter-32, verse-67

अथान्यं रथमास्थाय वृषसेनो महारथः ।
कर्णस्य युधि दुर्धर्षः पुनः पृष्ठमपालयत् ॥६७॥

67. athānyaṁ rathamāsthāya vṛṣaseno mahārathaḥ ,
karṇasya yudhi durdharṣaḥ punaḥ pṛṣṭhamapālayat.

67. atha anyam ratham āsthāya vṛṣasenaḥ mahārathaḥ
karṇasya yudhi durdharṣaḥ punaḥ pṛṣṭham apālayat

67. atha mahārathaḥ yudhi durdharṣaḥ vṛṣasenaḥ anyam
ratham āsthāya punaḥ karṇasya pṛṣṭham apālayat

67. Then, Vṛṣasena, the great warrior (mahāratha) and irresistible in battle, having mounted another chariot, again guarded Karṇa's rear.

Words meanings summery:

• अथ (atha) - then (then, now, thereupon)

• अन्यम् (anyam) - another (another, other)

• रथम् (ratham) - chariot

• आस्थाय (āsthāya) - having mounted (having mounted, having taken up, having resorted to)

• वृषसेनः (vṛṣasenaḥ) - Vṛṣasena (Vṛṣasena (proper name))

• महारथः (mahārathaḥ) - great warrior (great charioteer, great warrior)

• कर्णस्य (karṇasya) - of Karṇa

• युधि (yudhi) - in battle (in battle, in fight)

• दुर्धर्षः (durdharṣaḥ) - irresistible (irresistible, unconquerable, difficult to overcome)

• पुनः (punaḥ) - again (again, anew)

• पृष्ठम् (pṛṣṭham) - the rear (of Karṇa) (back, rear)

• अपालयत् (apālayat) - he guarded (he protected, he guarded)

Words meanings and morphology

अथ (atha) - then (then, now, thereupon)

(indeclinable)

अन्यम् (anyam) - another (another, other)

(pronoun)

Accusative, masculine, singular of anya

anya - other, another, different

Note: Modifies ratham.

रथम् (ratham) - chariot

(noun)

Accusative, masculine, singular of ratha

ratha - chariot, car

Note: Object of āsthāya.

आस्थाय (āsthāya) - having mounted (having mounted, having taken up, having resorted to)

(indeclinable)

Absolutive (Gerund)

From root sthā (to stand) with prefix ā- and suffix -ya (after prefix).

Prefix: ā

Root: sthā (class 1)

Note: Connects to apālayat.

वृषसेनः (vṛṣasenaḥ) - Vṛṣasena (Vṛṣasena (proper name))

(proper noun)

Nominative, masculine, singular of vṛṣasena

vṛṣasena - Vṛṣasena (proper name), a son of Karṇa

Note: Subject of the sentence.

महारथः (mahārathaḥ) - great warrior (great charioteer, great warrior)

(noun)

Nominative, masculine, singular of mahāratha

mahāratha - a great charioteer, a great warrior

Compound type : tatpurusha (mahā+ratha)

• mahā – great, mighty
  adjective
• ratha – chariot, warrior (by extension)
  noun (masculine)

Note: Epithet for Vṛṣasena.

कर्णस्य (karṇasya) - of Karṇa

(proper noun)

Genitive, masculine, singular of karṇa

karṇa - Karṇa (proper name), a great warrior in the Mahābhārata

Note: Possessive, governing pṛṣṭham.

युधि (yudhi) - in battle (in battle, in fight)

(noun)

Locative, feminine, singular of yudh

yudh - battle, fight, war

Note: Locative of circumstance.

दुर्धर्षः (durdharṣaḥ) - irresistible (irresistible, unconquerable, difficult to overcome)

(adjective)

Nominative, masculine, singular of durdharṣa

durdharṣa - irresistible, unconquerable, difficult to attack

Gerundive (Passive)

From root dhṛṣ (to dare, attack) with prefix dur- (difficult). Implies 'difficult to attack'.

Prefix: dur

Root: dhṛṣ (class 1)

Note: Qualifies Vṛṣasena.

पुनः (punaḥ) - again (again, anew)

(indeclinable)

Note: Modifies apālayat.

पृष्ठम् (pṛṣṭham) - the rear (of Karṇa) (back, rear)

(noun)

Accusative, neuter, singular of pṛṣṭha

pṛṣṭha - back, rear, surface, summit

Note: Object of apālayat.

अपालयत् (apālayat) - he guarded (he protected, he guarded)

(verb)

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

Imperfect

Causative of root pā (to protect); L-aṅ, 3rd person singular, active voice.

Root: pā (class 2)

Note: Main verb of the sentence.