महाभारतः mahābhārataḥ - book-3, chapter-166, verse-4

शङ्खानां च सहस्राणि मग्नान्यप्सु समन्ततः ।
दृश्यन्ते स्म यथा रात्रौ तारास्तन्वभ्रसंवृताः ॥४॥

4. śaṅkhānāṁ ca sahasrāṇi magnānyapsu samantataḥ ,
dṛśyante sma yathā rātrau tārāstanvabhrasaṁvṛtāḥ.

4. śaṅkhānām ca sahasrāṇi magnāni apsu samantataḥ
dṛśyante sma yathā rātrau tārāḥ tanvabhrasaṃvṛtāḥ

4. Thousands of conches were seen submerged everywhere in the waters, just as stars veiled by thin clouds appear at night.

Words meanings summery:

• शङ्खानाम् (śaṅkhānām) - of conches, of shells

• च (ca) - and, also

• सहस्राणि (sahasrāṇi) - thousands, a thousand

• मग्नानि (magnāni) - submerged, drowned, immersed

• अप्सु (apsu) - in the waters, in the rivers

• समन्ततः (samantataḥ) - all around, everywhere

• दृश्यन्ते (dṛśyante) - are seen, appear

• स्म (sma) - (indicates past action with present verb)

• यथा (yathā) - just as, as, like

• रात्रौ (rātrau) - at night, in the night

• ताराः (tārāḥ) - stars

• तन्वभ्रसंवृताः (tanvabhrasaṁvṛtāḥ) - covered by thin clouds

Words meanings and morphology

शङ्खानाम् (śaṅkhānām) - of conches, of shells

(noun)

Genitive, masculine, plural of śaṅkha

śaṅkha - conch, shell, a specific weapon

च (ca) - and, also

(indeclinable)

सहस्राणि (sahasrāṇi) - thousands, a thousand

(noun)

Nominative, neuter, plural of sahasra

sahasra - a thousand, an innumerable multitude

मग्नानि (magnāni) - submerged, drowned, immersed

(adjective)

Nominative, neuter, plural of magna

magna - submerged, immersed, sunk, disappeared

Past Passive Participle

From root MAJJ (to sink, dive) + kta suffix

Root: majj (class 6)

Note: Agrees with 'sahasrāṇi'

अप्सु (apsu) - in the waters, in the rivers

(noun)

Locative, feminine, plural of ap

ap - water, river

समन्ततः (samantataḥ) - all around, everywhere

(indeclinable)

दृश्यन्ते (dṛśyante) - are seen, appear

(verb)

3rd person , plural, passive, present (laṭ) of dṛś

Present Tense, Passive Voice

From root DṚŚ (to see), passive stem dṛśya, present 3rd plural dṛśyante

Root: dṛś (class 1)

स्म (sma) - (indicates past action with present verb)

(indeclinable)

यथा (yathā) - just as, as, like

(indeclinable)

रात्रौ (rātrau) - at night, in the night

(noun)

Locative, feminine, singular of rātri

rātri - night

ताराः (tārāḥ) - stars

(noun)

Nominative, feminine, plural of tārā

tārā - star, pupil of the eye

तन्वभ्रसंवृताः (tanvabhrasaṁvṛtāḥ) - covered by thin clouds

(adjective)

Nominative, feminine, plural of tanvabhrasaṃvṛta

tanvabhrasaṁvṛta - covered by thin clouds

Compound type : Instrumental Tatpurusha (tanu+abhra+saṃvṛta)

• tanu – thin, slender, delicate, subtle
  adjective (masculine/feminine/neuter)
• abhra – cloud, sky
  noun (neuter)
• saṃvṛta – covered, veiled, concealed
  adjective (masculine/feminine/neuter)
  Past Passive Participle
  From root VṚ (to cover, enclose) with prefix SAṂ + kta suffix
  Prefix: sam
  Root: vṛ (class 5)

Note: Agrees with 'tārāḥ'