योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-124, verse-20

अत्र रैवतके शैले वर्षे शिशिरनामनि ।
दशरात्रमभूत्सिंहः पूर्वो यक्षवशीकृतः ॥ २० ॥

atra raivatake śaile varṣe śiśiranāmani ,
daśarātramabhūtsiṃhaḥ pūrvo yakṣavaśīkṛtaḥ 20

20. atra raivatake śaile varṣe śiśiranāmani
daśarātram abhūt siṃhaḥ pūrvaḥ yakṣavaśīkṛtaḥ

20. atra raivatake śaile śiśiranāmani varṣe
pūrvaḥ yakṣavaśīkṛtaḥ siṃhaḥ daśarātram abhūt

20. Here, on the Raivataka mountain, in the region (varṣa) named Śiśira, Pūrva, subdued by a yakṣa, became a lion for ten nights.

Words meanings summery:

• अत्र (atra) - here, in this place (here, in this place, on this occasion)

• रैवतके (raivatake) - on the Raivataka mountain (in Raivataka)

• शैले (śaile) - on the mountain

• वर्षे (varṣe) - in the region (a division of the earth) (in the region, in the division of the earth)

• शिशिरनामनि (śiśiranāmani) - in the (region) named Śiśira (in that which is named Śiśira)

• दशरात्रम् (daśarātram) - for ten nights (duration) (for ten nights, during ten nights)

• अभूत् (abhūt) - became (became, was, happened)

• सिंहः (siṁhaḥ) - a lion

• पूर्वः (pūrvaḥ) - Pūrva (name of a son of Priyavrata) (Pūrva (a proper name), the former, eastern)

• यक्षवशीकृतः (yakṣavaśīkṛtaḥ) - subdued by a yakṣa, brought under control by a yakṣa

Words meanings and morphology

अत्र (atra) - here, in this place (here, in this place, on this occasion)

(indeclinable)

From pronominal root a-

रैवतके (raivatake) - on the Raivataka mountain (in Raivataka)

(proper noun)

Locative, masculine, singular of raivataka

raivataka - Name of a mountain or a region associated with it

Derived from revatī or revat

Note: Modifies 'śaile'.

शैले (śaile) - on the mountain

(noun)

Locative, masculine, singular of śaila

śaila - mountain, rock, hill

Derived from śilā (rock)

वर्षे (varṣe) - in the region (a division of the earth) (in the region, in the division of the earth)

(noun)

Locative, neuter, singular of varṣa

varṣa - year, rain, region, division of the earth

Root: vṛṣ (class 1)

शिशिरनामनि (śiśiranāmani) - in the (region) named Śiśira (in that which is named Śiśira)

(adjective)

Locative, neuter, singular of śiśiranāman

śiśiranāman - having the name Śiśira

Compound of śiśira (cold, name) and nāman (name)

Compound type : bahuvrīhi (śiśira+nāman)

• śiśira – cold, cool, winter, name of a season, name of a person/place
  noun (masculine)
• nāman – name, appellation, noun
  noun (neuter)

Note: Modifies 'varṣe'.

दशरात्रम् (daśarātram) - for ten nights (duration) (for ten nights, during ten nights)

(noun)

Accusative, neuter, singular of daśarātra

daśarātra - period of ten nights

Compound of daśa (ten) and rātra (night)

Compound type : dvigu (daśa+rātra)

• daśa – ten
  numeral
• rātra – night, nocturnal
  noun (neuter)
  Derivative of rātri (night)

Note: Functions as an adverbial accusative.

अभूत् (abhūt) - became (became, was, happened)

(verb)

3rd person , singular, active, aorist (luṅ) of bhū

Aorist 3rd singular

Root: bhū (class 1)

सिंहः (siṁhaḥ) - a lion

(noun)

Nominative, masculine, singular of siṃha

siṁha - lion

Note: Predicate nominative with 'abhūt'.

पूर्वः (pūrvaḥ) - Pūrva (name of a son of Priyavrata) (Pūrva (a proper name), the former, eastern)

(proper noun)

Nominative, masculine, singular of pūrva

pūrva - former, prior, eastern, chief, a proper name

Note: Subject of 'abhūt'.

यक्षवशीकृतः (yakṣavaśīkṛtaḥ) - subdued by a yakṣa, brought under control by a yakṣa

(adjective)

Nominative, masculine, singular of yakṣavaśīkṛta

yakṣavaśīkṛta - subdued by a yakṣa

Compound of yakṣa (yakṣa) and vaśīkṛta (made subservient)

Compound type : tatpuruṣa (yakṣa+vaśīkṛta)

• yakṣa – a class of demigods, often benevolent but sometimes mischievous
  noun (masculine)
• vaśīkṛta – made subservient, brought under control, subdued
  adjective (masculine)
  Past Passive Participle
  From root kṛ (to do, make) with prefix vaśī- (from vaśa, control)
  Root: kṛ (class 8)

Note: Modifies 'pūrvaḥ'.