महाभारतः mahābhārataḥ - book-11, chapter-25, verse-31

तदैव निहताः कृष्ण मम पुत्रास्तरस्विनः ।
यदैवाकृतकामस्त्वमुपप्लव्यं गतः पुनः ॥३१॥

31. tadaiva nihatāḥ kṛṣṇa mama putrāstarasvinaḥ ,
yadaivākṛtakāmastvamupaplavyaṁ gataḥ punaḥ.

31. tat eva nihitāḥ kṛṣṇa mama putrāḥ tarasvinaḥ |
yadā eva akṛtakāmaḥ tvam upaplavyam gataḥ punaḥ

31. kṛṣṇa mama tarasvinaḥ putrāḥ tat eva nihitāḥ
yadā eva tvam akṛtakāmaḥ punaḥ upaplavyam gataḥ

31. O Krishna, my powerful sons were indeed slain at that very moment when you, with your desires unfulfilled, returned to Upaplavyam.

Words meanings summery:

• तत् (tat) - then, at that time

• एव (eva) - indeed, certainly, only

• निहिताः (nihitāḥ) - slain, killed

• कृष्ण (kṛṣṇa) - O Krishna

• मम (mama) - my, of me

• पुत्राः (putrāḥ) - sons

• तरस्विनः (tarasvinaḥ) - powerful, strong, energetic

• यदा (yadā) - when

• एव (eva) - indeed, certainly, only

• अकृतकामः (akṛtakāmaḥ) - with desire unfulfilled, whose wish was not fulfilled

• त्वम् (tvam) - you

• उपप्लव्यम् (upaplavyam) - to Upaplavyam

• गतः (gataḥ) - gone, went

• पुनः (punaḥ) - again, back

Words meanings and morphology

तत् (tat) - then, at that time

(indeclinable)

एव (eva) - indeed, certainly, only

(indeclinable)

निहिताः (nihitāḥ) - slain, killed

(adjective)

Nominative, masculine, plural of nihita

nihita - placed, deposited, slain, killed

Past Passive Participle

Derived from root √han (to strike, kill) with prefix ni-.

Prefix: ni

Root: han (class 2)

कृष्ण (kṛṣṇa) - O Krishna

(proper noun)

Vocative, masculine, singular of kṛṣṇa

kṛṣṇa - Krishna (a name of Viṣṇu/God), dark, black

मम (mama) - my, of me

(pronoun)

Genitive, singular of asmad

asmad - I, me

पुत्राः (putrāḥ) - sons

(noun)

Nominative, masculine, plural of putra

putra - son

तरस्विनः (tarasvinaḥ) - powerful, strong, energetic

(adjective)

Nominative, masculine, plural of tarasvin

tarasvin - swift, energetic, powerful, strong

यदा (yadā) - when

(indeclinable)

एव (eva) - indeed, certainly, only

(indeclinable)

अकृतकामः (akṛtakāmaḥ) - with desire unfulfilled, whose wish was not fulfilled

(adjective)

Nominative, masculine, singular of akṛtakāma

akṛtakāma - one whose desire is unfulfilled

Compound type : bahuvrīhi (a+kṛta+kāma)

• a – not, un-
  indeclinable
• kṛta – done, made, fulfilled
  adjective (neuter)
  Past Passive Participle
  Derived from root √kṛ (to do, make).
  Root: kṛ (class 8)
• kāma – desire, wish, love
  noun (masculine)

त्वम् (tvam) - you

(pronoun)

Nominative, singular of yuṣmad

yuṣmad - you

उपप्लव्यम् (upaplavyam) - to Upaplavyam

(proper noun)

Accusative, neuter, singular of upaplavya

upaplavya - Upaplavya (name of a city)

गतः (gataḥ) - gone, went

(adjective)

Nominative, masculine, singular of gata

gata - gone, reached, past

Past Passive Participle

Derived from root √gam (to go).

Root: gam (class 1)

पुनः (punaḥ) - again, back

(indeclinable)