योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-88, verse-21

उद्दालीभूतमृद्वङ्गमज्जदन्तःकृमिव्रजम् ।
क्वचिदुद्भवदङ्गादिमूलं जलनिमज्जनम् ॥ २१ ॥

uddālībhūtamṛdvaṅgamajjadantaḥkṛmivrajam ,
kvacidudbhavadaṅgādimūlaṃ jalanimajjanam 21

21. uddālībhūtamṛdvaṅgamajjadantaḥkṛmivrajam
kvacit udbhavadaṅgādimūlam jalanimajjanam

21. kvacit uddālībhūtamṛdvaṅgamajjadantaḥkṛmivrajam
udbhavadaṅgādimūlam jalanimajjanam

21. Sometimes, there is an immersion in water, [manifesting as] a soft body that has become a pit, with swarms of worms immersed within it, and with roots emerging from its limbs and other parts.

Words meanings summery:

• उद्दालीभूतमृद्वङ्गमज्जदन्तःकृमिव्रजम् (uddālībhūtamṛdvaṅgamajjadantaḥkṛmivrajam) - a swarm of worms immersed within a soft body that has become a pit or hollow

• क्वचित् (kvacit) - sometimes, somewhere, here and there

• उद्भवदङ्गादिमूलम् (udbhavadaṅgādimūlam) - with roots emerging from the limbs/parts

• जलनिमज्जनम् (jalanimajjanam) - immersion in water, being submerged in water

Words meanings and morphology

उद्दालीभूतमृद्वङ्गमज्जदन्तःकृमिव्रजम् (uddālībhūtamṛdvaṅgamajjadantaḥkṛmivrajam) - a swarm of worms immersed within a soft body that has become a pit or hollow

(noun)

Nominative, neuter, singular of uddālībhūtamṛdvaṅgamajjadantaḥkṛmivraja

uddālībhūtamṛdvaṅgamajjadantaḥkṛmivraja - having a swarm of worms immersed within a soft body that has become a pit or hollow

Compound type : Bahuvrīhi (uddālībhūta+mṛdvaṅga+majjat+antaḥ+kṛmivraja)

• uddālībhūta – become like a pit/hollow, softened
  adjective
  Past Passive Participle
  From uddāla (pit/hollow) + bhū (to be, become) + kta suffix.
  Prefix: ut
  Root: bhū (class 1)
• mṛdvaṅga – soft-bodied, having soft limbs/parts
  adjective (neuter)
  From mṛdu (soft) + aṅga (body/limb).
• majjat – sinking, immersing, submerged
  adjective
  Present Active Participle
  From root majj (to sink) + śatṛ suffix.
  Root: majj (class 6)
• antaḥ – inside, within, internal
  indeclinable
• kṛmivraja – swarm/host of worms
  noun (neuter)
  From kṛmi (worm) + vraja (herd, flock, multitude).

Note: Descriptive adjective modifying 'jalanimajjanam'.

क्वचित् (kvacit) - sometimes, somewhere, here and there

(indeclinable)

From ka (who/what) + cit (enclitic particle for indefiniteness).

उद्भवदङ्गादिमूलम् (udbhavadaṅgādimūlam) - with roots emerging from the limbs/parts

(noun)

Nominative, neuter, singular of udbhavadaṅgādimūla

udbhavadaṅgādimūla - having roots emerging from the limbs and such

Compound formed from udbhavat (emerging) + aṅgādi (limbs etc.) + mūla (root).

Compound type : Bahuvrīhi (udbhavat+aṅgādi+mūla)

• udbhavat – emerging, arising
  adjective
  Present Active Participle
  From root bhū (to be) + ud (up) + śatṛ suffix.
  Prefix: ud
  Root: bhū (class 1)
• aṅgādi – limbs and so on, parts etc.
  noun
  From aṅga (limb, part) + ādi (beginning, etc.).
• mūla – root, origin, base
  noun (neuter)

Note: Adjectival compound, describing 'jalanimajjanam'.

जलनिमज्जनम् (jalanimajjanam) - immersion in water, being submerged in water

(noun)

Nominative, neuter, singular of jalanimajjana

jalanimajjana - immersion in water, state of being submerged in water

Action noun

From jala (water) + nimajjana (immersion, from ni + majj + lyuṭ).

Compound type : Tatpuruṣa (jala+nimajjana)

• jala – water
  noun (neuter)
• nimajjana – immersion, dipping, sinking
  noun (neuter)
  Derived from root majj with prefix ni.
  Prefix: ni
  Root: majj (class 6)

Note: The subject of the sentence or the state being described.