योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-4, verse-30

यमकायोपमाश्यामा ययौ तिमिरमांसला ।
आययौ मिहिकास्फारा तत्र तेषामुषः शनैः ॥ ३० ॥

yamakāyopamāśyāmā yayau timiramāṃsalā ,
āyayau mihikāsphārā tatra teṣāmuṣaḥ śanaiḥ 30

30. yamakāyopamāśyāmā yayau timiramāṃsalā
āyayau mihikāsphārā tatra teṣām uṣaḥ śanaiḥ

30. yamakāyopamāśyāmā timiramāṃsalā yayau
tatra teṣām mihikāsphārā uṣaḥ śanaiḥ āyayau

30. The dense darkness, as black as the body of Yama, departed. Then, for them, the mist-laden dawn slowly arrived there.

Words meanings summery:

• यमकायोपमाश्यामा (yamakāyopamāśyāmā) - as black as the body of Yama (dark/black like Yama's body)

• ययौ (yayau) - departed (went, departed, passed away)

• तिमिरमांसला (timiramāṁsalā) - dense darkness (dense with darkness, full of gloom)

• आययौ (āyayau) - arrived (came, arrived, approached)

• मिहिकास्फारा (mihikāsphārā) - mist-laden (vast with mist, extended by fog)

• तत्र (tatra) - there (there, in that place)

• तेषाम् (teṣām) - for them (of them)

• उषः (uṣaḥ) - dawn (dawn, morning twilight)

• शनैः (śanaiḥ) - slowly (slowly, gradually, gently)

Words meanings and morphology

यमकायोपमाश्यामा (yamakāyopamāśyāmā) - as black as the body of Yama (dark/black like Yama's body)

(adjective)

Nominative, feminine, singular of yamakāyopamāśyāmā

yamakāyopamāśyāmā - dark/black like Yama's body

Compound type : bahuvrīhi (yama+kāya+upamā+śyāmā)

• yama – Yama (the god of death), restraint
  proper noun (masculine)
• kāya – body, collection, group
  noun (masculine)
• upamā – comparison, simile, likeness
  noun (feminine)
• śyāmā – dark, black, dark-colored (feminine form of śyāma)
  adjective (feminine)

ययौ (yayau) - departed (went, departed, passed away)

(verb)

3rd person , singular, active, perfect (lit) of yā

Root: yā (class 2)

तिमिरमांसला (timiramāṁsalā) - dense darkness (dense with darkness, full of gloom)

(adjective)

Nominative, feminine, singular of timiramāṃsalā

timiramāṁsalā - dense with darkness, full of gloom

Compound type : tatpuruṣa (timira+māṃsalā)

• timira – darkness, gloom, obscurity
  noun (neuter)
• māṃsalā – fleshy, stout, dense, abundant (feminine form of māṃsala)
  adjective (feminine)

आययौ (āyayau) - arrived (came, arrived, approached)

(verb)

3rd person , singular, active, perfect (lit) of yā

Prefix: ā

Root: yā (class 2)

मिहिकास्फारा (mihikāsphārā) - mist-laden (vast with mist, extended by fog)

(adjective)

Nominative, feminine, singular of mihikāsphārā

mihikāsphārā - vast with mist, extended by fog

Compound type : tatpuruṣa (mihikā+sphārā)

• mihikā – mist, fog, hoarfrost
  noun (feminine)
• sphārā – vast, extensive, expanded (feminine form of sphāra)
  adjective (feminine)

तत्र (tatra) - there (there, in that place)

(indeclinable)

तेषाम् (teṣām) - for them (of them)

(pronoun)

Genitive, masculine, plural of tad

tad - that, he, she, it

उषः (uṣaḥ) - dawn (dawn, morning twilight)

(noun)

Nominative, feminine, singular of uṣas

uṣas - dawn, morning twilight

शनैः (śanaiḥ) - slowly (slowly, gradually, gently)

(indeclinable)