महाभारतः mahābhārataḥ - book-12, chapter-221, verse-8

तावाप्लुत्य यतात्मानौ कृतजप्यौ समासतुः ।
नद्याः पुलिनमासाद्य सूक्ष्मकाञ्चनवालुकम् ॥८॥

8. tāvāplutya yatātmānau kṛtajapyau samāsatuḥ ,
nadyāḥ pulinamāsādya sūkṣmakāñcanavālukam.

8. tau āplutya yatātmānau kṛtajapyau samāsatuḥ
nadyāḥ pulinam āsādya sūkṣmakāñcanavālukam

8. tau āplutya yatātmānau kṛtajapyau
sūkṣmakāñcanavālukam nadyāḥ pulinam āsādya samāsatuḥ

8. Having bathed, those two, self-controlled (yatātmānau) and having completed their sacred recitations, sat down. They had reached the river's sandbank, which was covered with fine golden sand.

Words meanings summery:

• तौ (tau) - those two (referring to Indra and another person from previous context) (those two, they two)

• आप्लुत्य (āplutya) - having bathed (having bathed, having immersed)

• यतात्मानौ (yatātmānau) - self-controlled (self-controlled, with controlled self (ātman))

• कृतजप्यौ (kṛtajapyau) - having performed their sacred recitations/prayers (having performed recitations, having done what is to be recited)

• समासतुः (samāsatuḥ) - sat down (they two sat down)

• नद्याः (nadyāḥ) - of the river

• पुलिनम् (pulinam) - sandbank (sandbank, shore, island)

• आसाद्य (āsādya) - having reached (having reached, having obtained, having approached)

• सूक्ष्मकाञ्चनवालुकम् (sūkṣmakāñcanavālukam) - covered with fine golden sand (having fine golden sand)

Words meanings and morphology

तौ (tau) - those two (referring to Indra and another person from previous context) (those two, they two)

(pronoun)

Nominative, masculine, dual of tad

tad - that, he, she, it

Note: Agrees with yatātmānau and kṛtajapyau.

आप्लुत्य (āplutya) - having bathed (having bathed, having immersed)

(indeclinable)

Absolutive (Gerund)

From ā-√plu, absolutive formed with suffix -ya because of the prefix ā.

Prefix: ā

Root: plu (class 1)

यतात्मानौ (yatātmānau) - self-controlled (self-controlled, with controlled self (ātman))

(adjective)

Nominative, masculine, dual of yatātman

yatātman - self-controlled, one whose inner self (ātman) is subdued

Compound: yata (controlled, PPP of √yam) + ātman (self).

Compound type : bahuvrīhi (yata+ātman)

• yata – controlled, restrained, self-governed
  adjective
  Past Passive Participle
  From √yam (to restrain, control)
  Root: yam (class 1)
• ātman – self, soul, essence, individual spirit
  noun (masculine)

Note: Describes tau.

कृतजप्यौ (kṛtajapyau) - having performed their sacred recitations/prayers (having performed recitations, having done what is to be recited)

(adjective)

Nominative, masculine, dual of kṛtajapya

kṛtajapya - one who has performed his prayers/recitations

Compound: kṛta (done, PPP of √kṛ) + japya (to be recited, gerundive of √jap).

Compound type : bahuvrīhi (kṛta+japya)

• kṛta – done, made, performed
  adjective
  Past Passive Participle
  From √kṛ (to do, make)
  Root: kṛ (class 8)
• japya – to be recited, fit to be whispered (mantra)
  adjective
  Gerundive
  From √jap (to whisper, mutter, recite prayers)
  Root: jap (class 1)

Note: Describes tau.

समासतुः (samāsatuḥ) - sat down (they two sat down)

(verb)

3rd person , dual, active, perfect (liṭ) of samā√as

Perfect active

From sam-ā-√ās. Perfect tense form of √ās.

Prefixes: sam+ā

Root: ās (class 2)

Note: The main verb of the first clause.

नद्याः (nadyāḥ) - of the river

(noun)

Genitive, feminine, singular of nadī

nadī - river

Note: Qualifies pulinam.

पुलिनम् (pulinam) - sandbank (sandbank, shore, island)

(noun)

Accusative, neuter, singular of pulina

pulina - sandbank, shore, island, alluvial land

Note: Object of āsādya.

आसाद्य (āsādya) - having reached (having reached, having obtained, having approached)

(indeclinable)

Absolutive (Gerund)

From ā-√sad, absolutive formed with suffix -ya.

Prefix: ā

Root: sad (class 1)

सूक्ष्मकाञ्चनवालुकम् (sūkṣmakāñcanavālukam) - covered with fine golden sand (having fine golden sand)

(adjective)

Accusative, neuter, singular of sūkṣmakāñcanavāluka

sūkṣmakāñcanavāluka - having fine golden sand

Compound: sūkṣma (fine) + kāñcana (golden) + vāluka (sand).

Compound type : bahuvrīhi (sūkṣma+kāñcana+vāluka)

• sūkṣma – fine, subtle, minute, delicate
  adjective
• kāñcana – golden, made of gold
  adjective (neuter)
  Derived from kāñcana (gold)
• vāluka – sand
  noun (neuter)
  Often seen as vālukā (feminine). Here it's neuter.

Note: Describes pulinam.