योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-38, verse-12

ततो दुन्दुभयो नेदुः प्रतिध्वनितदिङ्मुखाः ।
महाप्रलयसंशान्तौ पुष्करावर्तका इव ॥ १२ ॥

tato dundubhayo neduḥ pratidhvanitadiṅmukhāḥ ,
mahāpralayasaṃśāntau puṣkarāvartakā iva 12

12. tataḥ dundubhayaḥ neduḥ pratidhvanitadiṅmukhāḥ
mahāpralayasaṃśāntau puṣkarāvartakāḥ iva

12. tataḥ pratidhvanitadiṅmukhāḥ dundubhayaḥ
mahāpralayasaṃśāntau puṣkarāvartakāḥ iva neduḥ

12. Then the war-drums roared, their sound echoing in all directions, just like the Puṣkarāvartaka clouds at the cessation of the great cosmic dissolution (pralaya).

Words meanings summery:

• ततः (tataḥ) - then (then, thereupon, from that)

• दुन्दुभयः (dundubhayaḥ) - war-drums (war-drums, drums)

• नेदुः (neduḥ) - roared (roared, sounded, thundered)

• प्रतिध्वनितदिङ्मुखाः (pratidhvanitadiṅmukhāḥ) - whose sound echoed in all directions (whose quarters/directions are re-echoed)

• महाप्रलयसंशान्तौ (mahāpralayasaṁśāntau) - at the cessation of the great cosmic dissolution (pralaya) (at the cessation of the great dissolution)

• पुष्करावर्तकाः (puṣkarāvartakāḥ) - Puṣkarāvartaka clouds (Puṣkarāvartaka clouds (mythological clouds that appear at the time of cosmic dissolution))

• इव (iva) - just like (like, as if)

Words meanings and morphology

ततः (tataḥ) - then (then, thereupon, from that)

(indeclinable)

Note: From pronominal stem `tad`.

दुन्दुभयः (dundubhayaḥ) - war-drums (war-drums, drums)

(noun)

Nominative, masculine, plural of dundubhi

dundubhi - a large drum, war-drum

नेदुः (neduḥ) - roared (roared, sounded, thundered)

(verb)

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

Root: nad (class 1)

Note: From root `√nad` (to roar, sound).

प्रतिध्वनितदिङ्मुखाः (pratidhvanitadiṅmukhāḥ) - whose sound echoed in all directions (whose quarters/directions are re-echoed)

(adjective)

Nominative, masculine, plural of pratidhvanitadiṅmukha

pratidhvanitadiṅmukha - re-echoing the quarters/directions

Compound type : bahuvrihi (pratidhvanita+diś+mukha)

• pratidhvanita – re-echoed, reverberated
  adjective (neuter)
  Past Passive Participle
  From `prati-√dhvan`
  Prefix: prati
  Root: dhvan (class 1)
• diś – direction, quarter of the sky
  noun (feminine)
• mukha – face, mouth, opening, front, entrance
  noun (neuter)

Note: It qualifies `dundubhayaḥ`.

महाप्रलयसंशान्तौ (mahāpralayasaṁśāntau) - at the cessation of the great cosmic dissolution (pralaya) (at the cessation of the great dissolution)

(noun)

Locative, feminine, singular of mahāpralayasaṃśānti

mahāpralayasaṁśānti - cessation of a great dissolution (pralaya)

Compound type : tatpurusha (mahāpralaya+saṃśānti)

• mahāpralaya – great dissolution (pralaya)
  noun (masculine)
• saṃśānti – cessation, perfect tranquility, end
  noun (feminine)
  From `sam-√śam` (to cease, become quiet)
  Prefix: sam
  Root: śam (class 4)

पुष्करावर्तकाः (puṣkarāvartakāḥ) - Puṣkarāvartaka clouds (Puṣkarāvartaka clouds (mythological clouds that appear at the time of cosmic dissolution))

(noun)

Nominative, masculine, plural of puṣkarāvartaka

puṣkarāvartaka - a class of clouds that bring rain at the time of universal destruction

इव (iva) - just like (like, as if)

(indeclinable)

Note: Particle of comparison.