योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-112, verse-27

हूणा आमस्तकं मग्ना उत्तरार्णवसैकते ।
क्लिन्नास्तत्रैव पङ्कान्तः पूरणाविलशूलवत् ॥ २७ ॥

hūṇā āmastakaṃ magnā uttarārṇavasaikate ,
klinnāstatraiva paṅkāntaḥ pūraṇāvilaśūlavat 27

27. hūṇāḥ āmastakam magnāḥ uttarārṇavasaikate
klinnāḥ tatra eva paṅkāntaḥ pūraṇaāvilaśūlavat

27. hūṇāḥ āmastakam uttarārṇavasaikate magnāḥ
tatra eva paṅkāntaḥ pūraṇaāvilaśūlavat klinnāḥ

27. The Hūṇas were submerged up to their heads in the sand of the northern ocean, drenched in the mire right there, like stakes covered with turbid mud.

Words meanings summery:

• हूणाः (hūṇāḥ) - Hūṇas (a Central Asian people)

• आमस्तकम् (āmastakam) - up to the head

• मग्नाः (magnāḥ) - submerged, sunk

• उत्तरार्णवसैकते (uttarārṇavasaikate) - in the sand of the northern ocean

• क्लिन्नाः (klinnāḥ) - drenched, wet, moist

• तत्र (tatra) - there, in that place

• एव (eva) - indeed, just, precisely

• पङ्कान्तः (paṅkāntaḥ) - in the mire, within the mud

• पूरणआविलशूलवत् (pūraṇaāvilaśūlavat) - like a stake covered with turbid filling/mud

Words meanings and morphology

हूणाः (hūṇāḥ) - Hūṇas (a Central Asian people)

(proper noun)

Nominative, masculine, plural of hūṇa

hūṇa - Hūṇa, a tribal people from Central Asia

आमस्तकम् (āmastakam) - up to the head

(indeclinable)

Adverbial accusative, formed with prefix ā + mastaka (head)

Note: Used as an adverbial accusative.

मग्नाः (magnāḥ) - submerged, sunk

(adjective)

Nominative, masculine, plural of magna

magna - submerged, sunk, immersed

past passive participle

Past passive participle of root majj 'to sink'

Root: majj (class 6)

उत्तरार्णवसैकते (uttarārṇavasaikate) - in the sand of the northern ocean

(noun)

Locative, neuter, singular of uttarārṇavasaikata

uttarārṇavasaikata - sand (saikata) of the northern (uttara) ocean (arṇava)

Compound of uttarārṇava (northern ocean) and saikata (sand)

Compound type : ṣaṣṭhī-tatpuruṣa (uttarārṇava+saikata)

• uttarārṇava – northern ocean
  noun (masculine)
  Compound of uttara (northern) and arṇava (ocean)
• saikata – sand, sandy shore, sand bank
  noun (neuter)
  Derived from sikatā (sand)

क्लिन्नाः (klinnāḥ) - drenched, wet, moist

(adjective)

Nominative, masculine, plural of klinna

klinna - drenched, wet, moist, soaked

past passive participle

Past passive participle of root klid 'to be wet'

Root: klid (class 4)

तत्र (tatra) - there, in that place

(indeclinable)

Derived from pronoun tad + suffix -tra (locative adverb)

एव (eva) - indeed, just, precisely

(indeclinable)

पङ्कान्तः (paṅkāntaḥ) - in the mire, within the mud

(noun)

Locative, masculine, singular of paṅkānta

paṅkānta - inside the mud/mire, proximity to mud

Compound of paṅka (mud) and anta (end, interior)

Compound type : tatpuruṣa (paṅka+anta)

• paṅka – mud, mire, dirt, swamp
  noun (masculine)
  Derived from root paṅk 'to go'
  Root: paṅk
• anta – end, limit, interior, vicinity
  noun (masculine)
  Derived from root at 'to go'
  Root: at (class 1)

Note: Here, the compound functions adverbially as a locative, meaning 'within the mud'.

पूरणआविलशूलवत् (pūraṇaāvilaśūlavat) - like a stake covered with turbid filling/mud

(indeclinable)

Adverbial suffix -vat (like) appended to the compound pūraṇaāvilaśūla

Compound type : tatpuruṣa (pūraṇaāvilaśūla+vat)

• pūraṇaāvilaśūla – a stake turbid from filling/overflowing
  noun (masculine)
  Compound of pūraṇaāvila (turbid from filling) and śūla (stake)
• vat – like, as, similar to
  indeclinable
  Suffix -vat expressing similarity

Note: Adverbial usage, indicating similarity.