योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-77, verse-47

अशिक्षत बभूवाथ कलानामतिकोविदः ।
अमावास्यामिवेन्द्वर्कावन्योन्यविलसत्कलौ ॥ ४७ ॥

aśikṣata babhūvātha kalānāmatikovidaḥ ,
amāvāsyāmivendvarkāvanyonyavilasatkalau 47

47. aśikṣata babhūva atha kalānām atikovidaḥ
amāvāsyām iva indu arkau anyonyavilasatkalau

47. atha aśikṣata kalānām atikovidaḥ babhūva.
indu arkau amāvāsyām iva anyonyavilasatkalau.

47. He (the boy) learned and then became extremely skilled in the arts. The two of them (the boy and the girl) became like the Sun and Moon on a new moon day, each gloriously displaying their skills (or phases), through mutual interaction.

Words meanings summery:

• अशिक्षत (aśikṣata) - he learned, he studied

• बभूव (babhūva) - he became

• अथ (atha) - Indicates a sequence of events. (then, next, now)

• कलानाम् (kalānām) - of the arts, of the skills

• अतिकोविदः (atikovidaḥ) - extremely skilled, very expert

• अमावास्याम् (amāvāsyām) - on the new moon day

• इव (iva) - as if, like

• इन्दु (indu) - Part of the dual `indvarkau`. (Moon)

• अर्कौ (arkau) - `indu arkau` refers to the Moon and the Sun, as a pair. (Sun (dual form))

• अन्योन्यविलसत्कलौ (anyonyavilasatkalau) - Describes the boy and girl, like the Sun and Moon, each radiant in their own specific arts. (mutually shining with their skills/digits)

Words meanings and morphology

अशिक्षत (aśikṣata) - he learned, he studied

(verb)

3rd person , singular, active, imperfect past (Laṅ) of śikṣ

Imperfect active (ātmanepada)

3rd person, singular, imperfect active, ātmanepada. Root is technically causative of `śak` or desiderative of `śīkṣ`.

Root: śikṣ (class 1)

Note: Null gender as it's a verb, subject implied (masculine singular).

बभूव (babhūva) - he became

(verb)

3rd person , singular, active, perfect (Lit) of bhū

Perfect active

3rd person, singular, perfect active

Root: bhū (class 1)

अथ (atha) - Indicates a sequence of events. (then, next, now)

(indeclinable)

Particle

कलानाम् (kalānām) - of the arts, of the skills

(noun)

Genitive, feminine, plural of kalā

kalā - art, skill, a digit of the moon

Note: Indicates the domain of expertise.

अतिकोविदः (atikovidaḥ) - extremely skilled, very expert

(adjective)

Nominative, masculine, singular of atikovida

atikovida - very skilled, supremely expert, highly learned

From prefix `ati-` (excessive, beyond) + `kovida` (skilled, expert)

Compound type : pra-ādi tatpuruṣa (ati+kovida)

• ati – over, beyond, excessively, very
  prefix
• kovida – skilled, expert, wise, learned
  adjective (masculine)
  From 'ku' + 'vid' or 'ko' + 'vid'
  Root: vid (class 2)

Note: Describes the boy's proficiency.

अमावास्याम् (amāvāsyām) - on the new moon day

(noun)

Accusative, feminine, singular of amāvāsyā

amāvāsyā - new moon day, conjunction of sun and moon

From `amā` (together) + `vas` (to dwell) + `ya` suffix.

Root: vas (class 1)

Note: Indicates the temporal setting of the simile.

इव (iva) - as if, like

(indeclinable)

Particle expressing comparison or similitude

इन्दु (indu) - Part of the dual `indvarkau`. (Moon)

(noun)

masculine, singular of indu

indu - moon, drop, camphor

Root: und (class 7)

Note: Null case because it's part of `indvarkau` which is nominative dual.

अर्कौ (arkau) - `indu arkau` refers to the Moon and the Sun, as a pair. (Sun (dual form))

(noun)

Nominative, masculine, dual of arka

arka - Sun, Ray, praise, copper, plant

From root `arc` (to praise, shine).

Root: arc (class 1)

Note: `indvarkau` is a dvandva compound, 'the Moon and the Sun'.

अन्योन्यविलसत्कलौ (anyonyavilasatkalau) - Describes the boy and girl, like the Sun and Moon, each radiant in their own specific arts. (mutually shining with their skills/digits)

(adjective)

Nominative, masculine, dual of anyonyavilasatkala

anyonyavilasatkala - mutually shining or flourishing with their digits/arts

Compound: `anyonya` (mutual) + `vilasat` (shining, present participle of `vi-las`) + `kala` (digit, art).

Compound type : karmadhāraya (anyonya+vilasat+kala)

• anyonya – mutual, reciprocal, each other
  pronoun/adjective
• vilasat – shining, sparkling, flourishing, radiant
  adjective (present active participle) (masculine)
  Present Active Participle
  From root `las` (to shine, play) with prefix `vi` (apart, intensifier)
  Prefix: vi
  Root: las (class 1)
• kala – art, skill, a digit of the moon
  noun (feminine)

Note: Qualifies `indvarkau`, describing their mutual brilliance.