महाभारतः mahābhārataḥ - book-4, chapter-35, verse-13

अर्जुनस्य किलासीस्त्वं सारथिर्दयितः पुरा ।
त्वयाजयत्सहायेन पृथिवीं पाण्डवर्षभः ॥१३॥

13. arjunasya kilāsīstvaṁ sārathirdayitaḥ purā ,
tvayājayatsahāyena pṛthivīṁ pāṇḍavarṣabhaḥ.

13. arjunasya kila āsīḥ tvaṃ sārathiḥ dayitaḥ purā
| tvayā ajayat sahāyena pṛthivīṃ pāṇḍavarṣabhaḥ

13. Indeed, it is said that you were formerly Arjuna's beloved charioteer. With your assistance, the foremost of the Pāṇḍavas conquered the earth.

Words meanings summery:

• अर्जुनस्य (arjunasya) - of Arjuna

• किल (kila) - indeed, it is said, as if

• आसीः (āsīḥ) - you were

• त्वं (tvaṁ) - you

• सारथिः (sārathiḥ) - charioteer

• दयितः (dayitaḥ) - beloved, dear

• पुरा (purā) - formerly, previously, in olden times

• त्वया (tvayā) - by you

• अजयत् (ajayat) - he conquered

• सहायेन (sahāyena) - with your assistance (by a helper, with help)

• पृथिवीं (pṛthivīṁ) - the earth

• पाण्डवर्षभः (pāṇḍavarṣabhaḥ) - Refers to Arjuna. (the bull of the Pāṇḍavas, the foremost Pāṇḍava)

Words meanings and morphology

अर्जुनस्य (arjunasya) - of Arjuna

(proper noun)

Genitive, masculine, singular of arjuna

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

किल (kila) - indeed, it is said, as if

(indeclinable)

आसीः (āsīḥ) - you were

(verb)

2nd person , singular, active, imperfect past (laṅ) of as

Root: as (class 2)

त्वं (tvaṁ) - you

(pronoun)

Nominative, singular of tvam

tvam - you

सारथिः (sārathiḥ) - charioteer

(noun)

Nominative, masculine, singular of sārathi

sārathi - charioteer, driver

दयितः (dayitaḥ) - beloved, dear

(participle)

Nominative, masculine, singular of dayita

dayita - beloved, dear, liked

Past Passive Participle

Past Passive Participle from √day (to love, to pity).

Root: day (class 1)

पुरा (purā) - formerly, previously, in olden times

(indeclinable)

त्वया (tvayā) - by you

(pronoun)

Instrumental, singular of tvam

tvam - you

अजयत् (ajayat) - he conquered

(verb)

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

Root: ji (class 1)

सहायेन (sahāyena) - with your assistance (by a helper, with help)

(noun)

Instrumental, masculine, singular of sahāya

sahāya - helper, assistant, companion, aid, assistance

Note: The instrumental case implies 'by means of' or 'with the help of'.

पृथिवीं (pṛthivīṁ) - the earth

(noun)

Accusative, feminine, singular of pṛthivī

pṛthivī - earth, ground

Root: pṛth

पाण्डवर्षभः (pāṇḍavarṣabhaḥ) - Refers to Arjuna. (the bull of the Pāṇḍavas, the foremost Pāṇḍava)

(noun)

Nominative, masculine, singular of pāṇḍavarṣabha

pāṇḍavarṣabha - chief of the Pāṇḍavas, bull among the Pāṇḍavas

Compound type : tatpuruṣa (pāṇḍava+ṛṣabha)

• pāṇḍava – descendant of Pāṇḍu, belonging to Pāṇḍu
  noun (masculine)
• ṛṣabha – bull, chief, best, excellent
  noun (masculine)

Note: Refers to Arjuna.