महाभारतः mahābhārataḥ - book-3, chapter-299, verse-15

प्रच्छन्नं चापि धर्मज्ञ हरिणा वृत्रनिग्रहे ।
वज्रं प्रविश्य शक्रस्य यत्कृतं तच्च ते श्रुतम् ॥१५॥

15. pracchannaṁ cāpi dharmajña hariṇā vṛtranigrahe ,
vajraṁ praviśya śakrasya yatkṛtaṁ tacca te śrutam.

15. prachannam ca api dharmajña hariṇā vṛtranigrahe
vajram praviśya śakrasya yat kṛtam tat ca te śrutam

15. O knower of righteousness (dharma), you have also heard what Hari did, concealed and having entered Indra's thunderbolt (vajra), during the slaying of Vṛtra.

Words meanings summery:

• प्रछन्नम् (prachannam) - in a concealed manner (concealed, hidden)

• च (ca) - and, also

• अपि (api) - also, even

• धर्मज्ञ (dharmajña) - knower of dharma (natural law / righteousness)

• हरिणा (hariṇā) - by Vishnu (who assisted Indra) (by Hari, by Vishnu, by Indra)

• वृत्रनिग्रहे (vṛtranigrahe) - in the slaying of Vṛtra, in the conquering of Vṛtra

• वज्रम् (vajram) - Indra's thunderbolt (vajra) (thunderbolt, diamond)

• प्रविश्य (praviśya) - having entered, after entering

• शक्रस्य (śakrasya) - of Indra

• यत् (yat) - what, which, whatever

• कृतम् (kṛtam) - done, made, performed

• तत् (tat) - that

• च (ca) - and, also

• ते (te) - by you (as the agent of the passive verb) (by you, for you, of you)

• श्रुतम् (śrutam) - heard, known

Words meanings and morphology

प्रछन्नम् (prachannam) - in a concealed manner (concealed, hidden)

(participle)

Accusative, neuter, singular of prachanna

prachanna - hidden, concealed, covered

past passive participle

from pra + root chad (to cover, conceal)

Prefix: pra

Root: chad (class 1)

Note: Adverbial usage, describing the manner of action

च (ca) - and, also

(indeclinable)

Note: Conjunction

अपि (api) - also, even

(indeclinable)

Note: Particle

धर्मज्ञ (dharmajña) - knower of dharma (natural law / righteousness)

(noun)

Vocative, masculine, singular of dharmajña

dharmajña - knowing righteousness, knowing the law, skilled in justice

Compound type : upapada tatpurusha (dharma+jña)

• dharma – constitution, natural law, intrinsic nature, righteousness, duty, virtue
  noun (masculine)
  Root: dhṛ (class 1)
• jña – knowing, understanding, wise, knower
  adjective (masculine)
  agent noun from root jñā
  Root: jñā (class 9)

हरिणा (hariṇā) - by Vishnu (who assisted Indra) (by Hari, by Vishnu, by Indra)

(proper noun)

Instrumental, masculine, singular of hari

hari - Vishnu, Indra, lion, horse; tawny, green

Note: Agent of kṛtam

वृत्रनिग्रहे (vṛtranigrahe) - in the slaying of Vṛtra, in the conquering of Vṛtra

(noun)

Locative, masculine, singular of vṛtranigraha

vṛtranigraha - the slaying of Vṛtra

Compound type : ṣaṣṭhī tatpurusha (vṛtra+nigraha)

• vṛtra – name of an asura (demon), opponent of Indra
  proper noun (masculine)
  Root: vṛ
• nigraha – seizing, subduing, slaying, checking, restraining
  noun (masculine)
  from ni + root grah (to seize)
  Prefix: ni
  Root: grah (class 9)

Note: Meaning 'during' or 'in the event of' the slaying

वज्रम् (vajram) - Indra's thunderbolt (vajra) (thunderbolt, diamond)

(noun)

Accusative, neuter, singular of vajra

vajra - thunderbolt, diamond, weapon of Indra

Root: vaj

Note: Object of praviśya

प्रविश्य (praviśya) - having entered, after entering

(indeclinable)

absolutive / gerund

from pra + root viś (to enter)

Prefix: pra

Root: viś (class 6)

शक्रस्य (śakrasya) - of Indra

(proper noun)

Genitive, masculine, singular of śakra

śakra - Indra (a name of Indra)

Root: śak

Note: Possessive, 'Indra's'

यत् (yat) - what, which, whatever

(pronoun)

Nominative, neuter, singular of yad

yad - which, what, whatever

कृतम् (kṛtam) - done, made, performed

(participle)

Nominative, neuter, singular of kṛta

kṛta - done, made, performed, accomplished

past passive participle

from root kṛ (to do, make)

Root: kṛ (class 8)

Note: Predicate participle for yat

तत् (tat) - that

(pronoun)

Nominative, neuter, singular of tad

tad - that, it

च (ca) - and, also

(indeclinable)

Note: Conjunction

ते (te) - by you (as the agent of the passive verb) (by you, for you, of you)

(pronoun)

Dative, singular of yuṣmad

yuṣmad - you

Note: Used here with instrumental meaning with śrutam

श्रुतम् (śrutam) - heard, known

(participle)

Nominative, neuter, singular of śruta

śruta - heard, listened, revealed

past passive participle

from root śru (to hear)

Root: śru (class 5)

Note: Main verb, used impersonally with instrumental agent te