योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-39, verse-3

भूपातालनभोदिग्भ्यः प्रलयब्धिजलौघवत् ।
समाजग्मुस्तनत्ताला वेताला वलया इव ॥ ३ ॥

bhūpātālanabhodigbhyaḥ pralayabdhijalaughavat ,
samājagmustanattālā vetālā valayā iva 3

3. bhūpātālanabhodigbhyaḥ pralayābdhijalaughavat
samājagmuḥ tanattālāḥ vetālāḥ valayāḥ iva

3. bhūpātālanabhodigbhyaḥ pralayābdhijalaughavat
vetālāḥ tanattālāḥ valayāḥ iva samājagmuḥ

3. From the earth, netherworlds, sky, and directions, the Vetālas (demons) gathered, making rhythmic sounds and moving like circles, similar to the surging floods of water from the ocean of dissolution.

Words meanings summery:

• भूपातालनभोदिग्भ्यः (bhūpātālanabhodigbhyaḥ) - from the earth, netherworlds, sky, and directions

• प्रलयाब्धिजलौघवत् (pralayābdhijalaughavat) - like a flood of water from the ocean of dissolution

• समाजग्मुः (samājagmuḥ) - they assembled, they came together

• तनत्तालाः (tanattālāḥ) - making rhythmic sounds, having stretching rhythms/beats

• वेतालाः (vetālāḥ) - Vetālas, spirits, demons, vampires

• वलयाः (valayāḥ) - circles, rings, bracelets

• इव (iva) - like, as if, as

Words meanings and morphology

भूपातालनभोदिग्भ्यः (bhūpātālanabhodigbhyaḥ) - from the earth, netherworlds, sky, and directions

(noun)

Ablative, feminine, plural of bhūpātālanabhodig

bhūpātālanabhodig - earth, netherworld, sky, and direction (collectively)

Compound type : dvandva (bhū+pātāla+nabhas+diś)

• bhū – earth, ground
  noun (feminine)
• pātāla – netherworld, infernal region
  noun (masculine)
• nabhas – sky, atmosphere, heaven
  noun (neuter)
• diś – direction, quarter of the sky
  noun (feminine)

प्रलयाब्धिजलौघवत् (pralayābdhijalaughavat) - like a flood of water from the ocean of dissolution

(indeclinable)

Derived with the suffix -vat (like, similar to)

Compound type : tatpuruṣa (pralaya+abdhi+jala+ogha)

• pralaya – dissolution, destruction, cosmic reabsorption
  noun (masculine)
  Prefix: pra
  Root: lī (class 4)
• abdhi – ocean, sea (lit. 'receiver of waters')
  noun (masculine)
  Prefix: ap
  Root: dhā (class 3)
• jala – water
  noun (neuter)
• ogha – flood, torrent, stream, multitude
  noun (masculine)

समाजग्मुः (samājagmuḥ) - they assembled, they came together

(verb)

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

Prefixes: sam+ā

Root: gam (class 1)

तनत्तालाः (tanattālāḥ) - making rhythmic sounds, having stretching rhythms/beats

(adjective)

Nominative, masculine, plural of tanattāla

tanattāla - having stretched/extended rhythms or beats; making rhythmic sounds

Compound type : bahuvrīhi (tanat+tāla)

• tanat – stretching, extending, expanding, producing
  participle (masculine)
  Present Active Participle
  Derived from root tan (to stretch, extend)
  Root: tan (class 8)
• tāla – rhythm, musical measure, beat; clapping of hands; cymbals
  noun (masculine)

वेतालाः (vetālāḥ) - Vetālas, spirits, demons, vampires

(noun)

Nominative, masculine, plural of vetāla

vetāla - a ghost, spirit, demon, vampiric entity (often inhabiting corpses)

वलयाः (valayāḥ) - circles, rings, bracelets

(noun)

Nominative, masculine, plural of valaya

valaya - a circle, ring, bracelet, circumambulation

इव (iva) - like, as if, as

(indeclinable)