योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-48, verse-79

प्रपुस्फुरुः सुसौवर्णसर्पापत्सरणोपमाः ।
विद्युतो दिवि दैव्यस्त्रीकटाक्षवलना इव ॥ ७९ ॥

prapusphuruḥ susauvarṇasarpāpatsaraṇopamāḥ ,
vidyuto divi daivyastrīkaṭākṣavalanā iva 79

79. prapusphuruḥ susauvarṇasarpāpatsaraṇopamāḥ
vidyutaḥ divi daivyastrīkaṭākṣavalanā iva

79. vidyutaḥ divi susauvarṇasarpāpatsaraṇopamāḥ
daivyastrīkaṭākṣavalanāḥ iva prapusphuruḥ

79. The lightnings flashed brilliantly in the sky, resembling the sudden darting of very golden serpents, or like the fleeting side-glances of divine women.

Words meanings summery:

• प्रपुस्फुरुः (prapusphuruḥ) - flashed brilliantly (flashed brightly, throbbed, shone)

• सुसौवर्णसर्पापत्सरणोपमाः (susauvarṇasarpāpatsaraṇopamāḥ) - resembling the sudden darting of very golden serpents

• विद्युतः (vidyutaḥ) - the lightnings (lightnings, flashes of light)

• दिवि (divi) - in the sky (in the sky, in heaven, in the luminous region)

• दैव्यस्त्रीकटाक्षवलना (daivyastrīkaṭākṣavalanā) - the fleeting side-glances of divine women (the darting of the side-glances of divine women)

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

Words meanings and morphology

प्रपुस्फुरुः (prapusphuruḥ) - flashed brilliantly (flashed brightly, throbbed, shone)

(verb)

3rd person , plural, active, perfect (lit) of sphur

perfect active

3rd person plural, perfect tense, parasmaipada. With prefix pra (forth, intensely).

Prefix: pra

Root: sphur (class 6)

Note: The verb for the lightnings.

सुसौवर्णसर्पापत्सरणोपमाः (susauvarṇasarpāpatsaraṇopamāḥ) - resembling the sudden darting of very golden serpents

(adjective)

Nominative, feminine, plural of susauvarṇasarpāpatsaraṇopama

susauvarṇasarpāpatsaraṇopama - resembling the sudden darting of very golden serpents

Compound type : tatpuruṣa (su+sauvarṇa+sarpa+āpatsaraṇa+upama)

• su – good, well, very, excellent
  indeclinable
  Prefix/adverb
• sauvarṇa – golden, made of gold
  adjective (masculine)
  Derived from suvarṇa (gold)
• sarpa – serpent, snake
  noun (masculine)
  Derived from root sṛp (to creep)
  Root: sṛp (class 1)
• āpatsaraṇa – sudden movement, darting forth, rushing
  noun (neuter)
  Action noun from root sṛ (to run) with prefixes ā and pat
  Prefixes: ā+pat
  Root: sṛ (class 1)
• upama – resemblance, comparison, likeness
  adjective (masculine)

Note: Modifies 'vidyutaḥ' (lightnings).

विद्युतः (vidyutaḥ) - the lightnings (lightnings, flashes of light)

(noun)

Nominative, feminine, plural of vidyut

vidyut - lightning, flash

From root dyut (to shine) with prefix vi

Prefix: vi

Root: dyut (class 1)

Note: Subject of the verb 'prapusphuruḥ'.

दिवि (divi) - in the sky (in the sky, in heaven, in the luminous region)

(noun)

Locative, feminine, singular of div

div - sky, heaven, day, luminous region

Root: div

Note: Indicates location.

दैव्यस्त्रीकटाक्षवलना (daivyastrīkaṭākṣavalanā) - the fleeting side-glances of divine women (the darting of the side-glances of divine women)

(noun)

Nominative, feminine, singular of daivyastrīkaṭākṣavalana

daivyastrīkaṭākṣavalana - the darting/movement of side-glances of divine women

Compound type : tatpuruṣa (daivyastrī+kaṭākṣa+valana)

• daivyastrī – divine woman
  noun (feminine)
• kaṭākṣa – side-glance, leer, coquettish look
  noun (masculine)
• valana – turning, movement, darting, flickering
  noun (neuter)
  Action noun from root val (to move, turn)
  Root: val (class 1)

Note: Used as a simile with 'iva' to describe the lightnings.

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

(indeclinable)

Note: Connects the comparison.