वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-46, verse-21

आवर्त इव संजज्ञे उभयोः सेनयोस्तदा ।
क्षुभितस्याप्रमेयस्य सागरस्येव निस्वनः ॥२१॥

21. āvarta iva saṃjajñe ubhayoḥ senayostadā ,
kṣubhitasyāprameyasya sāgarasyeva nisvanaḥ.

21. āvartah iva sañjajñe ubhayoḥ senayoḥ tadā
kṣubhitasya aprameyasya sāgarasya iva nisvanaḥ

21. tada ubhayoḥ senayoḥ kṣubhitasya aprameyasya
sāgarasya iva āvartah iva nisvanaḥ sañjajñe

21. Then, a sound arose from both armies like a whirlpool, resembling the roar of a turbulent, immeasurable ocean.

Words meanings summery:

• आवर्तह् (āvartah) - whirlpool, eddy

• इव (iva) - like, as if, as

• सञ्जज्ञे (sañjajñe) - arose, was born, appeared

• उभयोः (ubhayoḥ) - of both

• सेनयोः (senayoḥ) - of armies

• तदा (tadā) - then, at that time

• क्षुभितस्य (kṣubhitasya) - of the agitated, of the disturbed

• अप्रमेयस्य (aprameyasya) - of the immeasurable, of the unfathomable

• सागरस्य (sāgarasya) - of the ocean

• इव (iva) - like, as if, as

• निस्वनः (nisvanaḥ) - roar, sound, noise

Words meanings and morphology

आवर्तह् (āvartah) - whirlpool, eddy

(noun)

Nominative, masculine, singular of āvarta

āvarta - whirlpool, eddy, turning, revolution

इव (iva) - like, as if, as

(indeclinable)

सञ्जज्ञे (sañjajñe) - arose, was born, appeared

(verb)

3rd person , singular, middle, perfect (lit) of sañjan

Root: jan (class 4)

उभयोः (ubhayoḥ) - of both

(pronoun)

Genitive, dual of ubhaya

ubhaya - both

सेनयोः (senayoḥ) - of armies

(noun)

Genitive, feminine, dual of senā

senā - army, host, weapon

तदा (tadā) - then, at that time

(indeclinable)

क्षुभितस्य (kṣubhitasya) - of the agitated, of the disturbed

(adjective)

Genitive, masculine, singular of kṣubhita

kṣubhita - agitated, disturbed, shaken

Past Passive Participle

Derived from root kṣubh (1st class) with past passive participle suffix -ita.

Root: kṣubh (class 1)

अप्रमेयस्य (aprameyasya) - of the immeasurable, of the unfathomable

(adjective)

Genitive, masculine, singular of aprameya

aprameya - immeasurable, unlimited, unfathomable

Gerundive

Derived from root mā (3rd class) with prefix pra- and gerundive suffix -eya, negated by a-.

Compound type : nañ-tatpuruṣa (a+prameya)

• a – not, un-
  indeclinable
• prameya – measurable, provable, knowable
  adjective (masculine)
  Gerundive
  From pra-mā, 'to measure, to know'.
  Prefix: pra
  Root: mā (class 3)

सागरस्य (sāgarasya) - of the ocean

(noun)

Genitive, masculine, singular of sāgara

sāgara - ocean, sea

इव (iva) - like, as if, as

(indeclinable)

निस्वनः (nisvanaḥ) - roar, sound, noise

(noun)

Nominative, masculine, singular of nisvana

nisvana - sound, roar, noise

Prefix: ni

Root: svan (class 1)