महाभारतः mahābhārataḥ - book-5, chapter-19, verse-6

अक्षौहिणी हि सेना सा तदा यौधिष्ठिरं बलम् ।
प्रविश्यान्तर्दधे राजन्सागरं कुनदी यथा ॥६॥

6. akṣauhiṇī hi senā sā tadā yaudhiṣṭhiraṁ balam ,
praviśyāntardadhe rājansāgaraṁ kunadī yathā.

6. akṣauhiṇī hi senā sā tadā yauhiṣṭhiram balam
praviśya antardadhe rājan sāgaram kunadī yathā

6. O King, that Akṣauhiṇī army, having joined Yudhishthira's force, then vanished completely, just as a small river merges into the ocean.

Words meanings summery:

• अक्षौहिणी (akṣauhiṇī) - an Akṣauhiṇī (a large military division)

• हि (hi) - indeed, for, surely

• सेना (senā) - army

• सा (sā) - that

• तदा (tadā) - then, at that time

• यौहिष्ठिरम् (yauhiṣṭhiram) - Yudhishthira's

• बलम् (balam) - force, army

• प्रविश्य (praviśya) - having entered

• अन्तर्दधे (antardadhe) - disappeared, became invisible

• राजन् (rājan) - O King

• सागरम् (sāgaram) - into the ocean

• कुनदी (kunadī) - a small/insignificant river

• यथा (yathā) - just as, like

Words meanings and morphology

अक्षौहिणी (akṣauhiṇī) - an Akṣauhiṇī (a large military division)

(noun)

Nominative, feminine, singular of akṣauhiṇī

akṣauhiṇī - an Akṣauhiṇī (a specific large division of an army, consisting of 21,870 chariots, 21,870 elephants, 65,610 cavalry, and 109,350 infantry)

Note: Subject of the sentence.

हि (hi) - indeed, for, surely

(indeclinable)

Note: Emphatic particle.

सेना (senā) - army

(noun)

Nominative, feminine, singular of senā

senā - army, host, military force

Note: Appositive to akṣauhiṇī.

सा (sā) - that

(pronoun)

Nominative, feminine, singular of tad

tad - that, she, it

तदा (tadā) - then, at that time

(indeclinable)

From tad (that) + suffix dā.

यौहिष्ठिरम् (yauhiṣṭhiram) - Yudhishthira's

(adjective)

Accusative, neuter, singular of yauhiṣṭhira

yauhiṣṭhira - belonging to Yudhishthira, Yudhishthira's

Derived from Yudhiṣṭhira with aṇ suffix.

Note: Agrees with balam.

बलम् (balam) - force, army

(noun)

Accusative, neuter, singular of bala

bala - strength, power, army, force

Note: Object of praviśya.

प्रविश्य (praviśya) - having entered

(indeclinable)

Absolutive (Gerund)

From root viś (to enter) with prefix pra.

Prefix: pra

Root: viś (class 6)

अन्तर्दधे (antardadhe) - disappeared, became invisible

(verb)

3rd person , singular, middle, past perfect (lit) of antardhā

Perfect Middle (Ātmanepada)

3rd person singular, Perfect Tense. From antar (within/invisibly) + root dhā (to place/hold).

Prefix: antar

Root: dhā (class 3)

राजन् (rājan) - O King

(noun)

Vocative, masculine, singular of rājan

rājan - king, ruler

Root: rāj (class 1)

सागरम् (sāgaram) - into the ocean

(noun)

Accusative, masculine, singular of sāgara

sāgara - ocean, sea

Note: Used with praviśya (implicitly in the simile) and kunadī.

कुनदी (kunadī) - a small/insignificant river

(noun)

Nominative, feminine, singular of kunadī

kunadī - a bad/small/insignificant river

From prefix ku (bad, inferior, small) + nadī (river).

Compound type : kugati compound (ku+nadī)

• ku – bad, evil, inferior, small
  indeclinable
  Prefix.
• nadī – river
  noun (feminine)
  From root nad (to sound, to roar).
  Root: nad (class 1)

Note: Subject of the simile.

यथा (yathā) - just as, like

(indeclinable)