महाभारतः mahābhārataḥ - book-4, chapter-43, verse-10

अद्याहमृणमक्षय्यं पुरा वाचा प्रतिश्रुतम् ।
धार्तराष्ट्रस्य दास्यामि निहत्य समरेऽर्जुनम् ॥१०॥

10. adyāhamṛṇamakṣayyaṁ purā vācā pratiśrutam ,
dhārtarāṣṭrasya dāsyāmi nihatya samare'rjunam.

10. adya aham ṛṇam akṣayyam purā vācā pratiśrutam
dhārtarāṣṭrasya dāsyāmi nihatya samare arjunam

10. Today, I will repay the inexhaustible debt that I formerly promised by word to the son of Dhṛtarāṣṭra, after killing Arjuna in battle.

Words meanings summery:

• अद्य (adya) - today

• अहम् (aham) - I

• ऋणम् (ṛṇam) - debt, obligation

• अक्षय्यम् (akṣayyam) - imperishable, inexhaustible, eternal

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

• वाचा (vācā) - by word, by speech, by voice

• प्रतिश्रुतम् (pratiśrutam) - promised, vowed, agreed

• धार्तराष्ट्रस्य (dhārtarāṣṭrasya) - of Duryodhana (of the son of Dhṛtarāṣṭra)

• दास्यामि (dāsyāmi) - I will repay (I will give, I will bestow)

• निहत्य (nihatya) - having killed, having struck down

• समरे (samare) - in battle, in war, on the battlefield

• अर्जुनम् (arjunam) - Arjuna

Words meanings and morphology

अद्य (adya) - today

(indeclinable)

अहम् (aham) - I

(pronoun)

Nominative, singular of aham

aham - I

ऋणम् (ṛṇam) - debt, obligation

(noun)

Accusative, neuter, singular of ṛṇa

ṛṇa - debt, obligation, duty

Note: Object of dāsyāmi.

अक्षय्यम् (akṣayyam) - imperishable, inexhaustible, eternal

(adjective)

Accusative, neuter, singular of akṣayya

akṣayya - imperishable, inexhaustible, undecaying, eternal

Gerundive/Future Passive Participle (negative)

a- (not) + kṣayya (perishable, from root √kṣi 'to perish')

Compound type : bahuvrihi (a+kṣayya)

• a – not, un-
  indeclinable
  Negative prefix
• kṣayya – perishable, destructible, exhaustible
  adjective (neuter)
  Gerundive/Future Passive Participle
  From root √kṣi (to perish)
  Root: kṣi (class 5)

Note: Qualifies ṛṇam.

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

(indeclinable)

Note: Adverb of time.

वाचा (vācā) - by word, by speech, by voice

(noun)

Instrumental, feminine, singular of vāc

vāc - word, speech, voice, language

Note: Instrument of promising.

प्रतिश्रुतम् (pratiśrutam) - promised, vowed, agreed

(adjective)

Accusative, neuter, singular of pratiśruta

pratiśruta - promised, vowed, agreed, assented to

Past Passive Participle

Derived from root √śru (to hear) with upasarga prati- (in response, back)

Prefix: prati

Root: śru (class 5)

Note: Qualifies ṛṇam.

धार्तराष्ट्रस्य (dhārtarāṣṭrasya) - of Duryodhana (of the son of Dhṛtarāṣṭra)

(proper noun)

Genitive, masculine, singular of dhārtarāṣṭra

dhārtarāṣṭra - son of Dhṛtarāṣṭra, belonging to Dhṛtarāṣṭra

Derived from Dhṛtarāṣṭra with patronymic suffix aṇ

Note: Recipient of the debt (implicitly to Duryodhana as the main son).

दास्यामि (dāsyāmi) - I will repay (I will give, I will bestow)

(verb)

1st person , singular, active, future (lṛṭ) of dā

Future Tense

First person singular, parasmaipada, future tense

Root: dā (class 1)

निहत्य (nihatya) - having killed, having struck down

(indeclinable)

Absolutive/Gerund

Derived from root √han (to strike, kill) with upasarga ni-, and -tya suffix

Prefix: ni

Root: han (class 2)

समरे (samare) - in battle, in war, on the battlefield

(noun)

Locative, masculine, singular of samara

samara - battle, war, conflict

Note: Location of killing.

अर्जुनम् (arjunam) - Arjuna

(proper noun)

Accusative, masculine, singular of arjuna

arjuna - Arjuna (proper name, 'white, silver')

Note: Object of nihatya.