योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-71, verse-45

नृत्यन्तीव तरङ्गौधैर्जलावलनवेधिनः ।
जलाचलाचलान्योन्यसंघट्टस्फोटपण्डिताः ॥ ४५ ॥

nṛtyantīva taraṅgaudhairjalāvalanavedhinaḥ ,
jalācalācalānyonyasaṃghaṭṭasphoṭapaṇḍitāḥ 45

45. nṛtyanti iva taraṅgaughaiḥ jalāvalanavedhinaḥ
jalācalācalānyonyasaṅghaṭṭasphoṭapaṇḍitāḥ

45. taraṅgaughaiḥ jalāvalanavedhinaḥ nṛtyanti
iva jalācalācalānyonyasaṅghaṭṭasphoṭapaṇḍitāḥ

45. They seem to dance with their masses of waves, piercing through the water's depths, and are skilled in the exploding collisions of mutually unsteady, mountain-like water masses.

Words meanings summery:

• नृत्यन्ति (nṛtyanti) - they dance

• इव (iva) - as if (as if, like, similar to)

• तरङ्गौघैः (taraṅgaughaiḥ) - with masses of waves (by masses of waves, by multitudes of surges)

• जलावलनवेधिनः (jalāvalanavedhinaḥ) - piercing through the water's depths (piercing the water's embrace/movement/depths)

• जलाचलाचलान्योन्यसङ्घट्टस्फोटपण्डिताः (jalācalācalānyonyasaṅghaṭṭasphoṭapaṇḍitāḥ) - skilled in the exploding collisions of mutually unsteady, mountain-like water masses (adept at the bursting collisions of mutually unsteady water-mountains (massive waves))

Words meanings and morphology

नृत्यन्ति (nṛtyanti) - they dance

(verb)

3rd person , plural, active, present (laṭ) of nṛt

Present active

3rd person plural, Parasmaipada, Present Indicative. Root in 4th class.

Root: nṛt (class 4)

इव (iva) - as if (as if, like, similar to)

(indeclinable)

तरङ्गौघैः (taraṅgaughaiḥ) - with masses of waves (by masses of waves, by multitudes of surges)

(noun)

Instrumental, masculine, plural of taraṅgaugha

taraṅgaugha - mass of waves, multitude of surges

Compound type : tatpurusha (taraṅga+ogha)

• taraṅga – wave, billow, surge
  noun (masculine)
  Root: tṛ (class 1)
• ogha – mass, multitude, flood, current
  noun (masculine)

जलावलनवेधिनः (jalāvalanavedhinaḥ) - piercing through the water's depths (piercing the water's embrace/movement/depths)

(adjective)

Nominative, masculine, plural of jalāvalanavedhin

jalāvalanavedhin - one who pierces the water's embrace/movement/depths

The suffix -in creates an agent noun/adjective.

Compound type : tatpurusha (jala+avalana+vedhin)

• jala – water
  noun (neuter)
• avalana – covering, embracing, descending, plunging, movement, agitation, penetration
  noun (neuter)
  action noun
  Derived from root aval
  Prefix: ava
  Root: aval (class 1)
• vedhin – piercing, striking, hitting, affecting
  adjective (masculine/feminine/neuter)
  agent noun/adjective
  Derived from root vyadh
  Root: vyadh (class 4)

Note: This describes the waves (implicit subject).

जलाचलाचलान्योन्यसङ्घट्टस्फोटपण्डिताः (jalācalācalānyonyasaṅghaṭṭasphoṭapaṇḍitāḥ) - skilled in the exploding collisions of mutually unsteady, mountain-like water masses (adept at the bursting collisions of mutually unsteady water-mountains (massive waves))

(adjective)

Nominative, masculine, plural of jalācalācalānyonyasaṅghaṭṭasphoṭapaṇḍita

jalācalācalānyonyasaṅghaṭṭasphoṭapaṇḍita - expert in the bursting crashes of mutual, trembling water-mountains

Compound type : tatpurusha (jala+acalācala+anyonyasaṅghaṭṭasphoṭa+paṇḍita)

• jala – water
  noun (neuter)
• acalācala – trembling, unsteady, tottering; a mountain (reduplicated)
  adjective/noun (masculine/neuter)
  Reduplicated for emphasis or referring to mountain-like entity that is unstable.
• anyonyasaṅghaṭṭasphoṭa – bursting collision with each other, mutual shattering impact
  noun (masculine)
• anyonyasaṅghaṭṭa – mutual collision, clash with each other
  noun (masculine)
• anyonya – mutual, each other
  pronoun/adjective (masculine/feminine/neuter)
• saṅghaṭṭa – collision, clash, friction, mutual impact
  noun (masculine)
  action noun
  From root ghaṭṭ with saṃ
  Prefix: sam
  Root: ghaṭṭ (class 10)
• sphoṭa – bursting, explosion, shattering, crackling
  noun (masculine)
  action noun
  From root sphuṭ
  Root: sphuṭ (class 6)
• paṇḍita – skilled, adept, learned, expert, wise
  adjective (masculine/feminine/neuter)

Note: This describes the waves (implicit subject).