योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-3, verse-15

विस्तारः कर्मणां देहः सोऽहंतात्मा ससंसृतिः ।
अचेतनानहन्त्वेन शाम्यत्यस्पन्दवातवत् ॥ १५ ॥

vistāraḥ karmaṇāṃ dehaḥ so'haṃtātmā sasaṃsṛtiḥ ,
acetanānahantvena śāmyatyaspandavātavat 15

15. vistāraḥ karmaṇām dehaḥ saḥ ahantā ātmā sasamsṛtiḥ
| acetanā anahantvena śāmyati aspandavātavat ||

15. karmaṇām vistāraḥ dehaḥ saḥ ahantā ātmā sasamsṛtiḥ
acetanā anahantvena aspandavātavat śāmyati

15. The body is the expansion of actions (karma); that is the individual self (ātman) identified with ego (ahaṅkāra), perpetuating the cycle of rebirth (saṃsāra). Through insentient non-ego-ness, it subsides like a wind without vibration.

Words meanings summery:

• विस्तारः (vistāraḥ) - expansion, diffusion, manifestation, elaboration

• कर्मणाम् (karmaṇām) - of actions, of deeds (karma)

• देहः (dehaḥ) - body, corporeal frame

• सः (saḥ) - that, he

• अहन्ता (ahantā) - ego, egoism, I-ness (ahaṅkāra)

• आत्मा (ātmā) - The individual self identified with ego. (Self, soul, essence, individual soul (ātman))

• ससम्सृतिः (sasamsṛtiḥ) - with transmigration, bound by the cycle of rebirth (saṃsāra)

• अचेतना (acetanā) - unconscious, insentient, inert

• अनहन्त्वेन (anahantvena) - by non-ego-ness, by the absence of ego

• शाम्यति (śāmyati) - subsides, calms down, ceases, becomes quiet

• अस्पन्दवातवत् (aspandavātavat) - like a wind without vibration, like still wind

Words meanings and morphology

विस्तारः (vistāraḥ) - expansion, diffusion, manifestation, elaboration

(noun)

Nominative, masculine, singular of vistāra

vistāra - expansion, diffusion, manifestation, spreading, detail

Prefix: vi

Root: stṛ (class 9)

कर्मणाम् (karmaṇām) - of actions, of deeds (karma)

(noun)

Genitive, neuter, plural of karma

karma - action, deed, work, ritual, fate, effect of actions

Root: kṛ (class 8)

देहः (dehaḥ) - body, corporeal frame

(noun)

Nominative, masculine, singular of deha

deha - body, corporeal frame, person

Root: dih (class 4)

सः (saḥ) - that, he

(pronoun)

Nominative, masculine, singular of tad

tad - that, it, he, she

Note: Refers to 'deha'

अहन्ता (ahantā) - ego, egoism, I-ness (ahaṅkāra)

(noun)

Nominative, feminine, singular of ahantā

ahantā - ego, egoism, I-ness, individuality (ahaṅkāra)

आत्मा (ātmā) - The individual self identified with ego. (Self, soul, essence, individual soul (ātman))

(noun)

Nominative, masculine, singular of ātman

ātman - Self, soul, essence, spirit, individual soul, supreme soul

Root: an (class 2)

ससम्सृतिः (sasamsṛtiḥ) - with transmigration, bound by the cycle of rebirth (saṃsāra)

(adjective)

Nominative, feminine, singular of sasamsṛti

sasamsṛti - having transmigration, bound by saṃsāra, existing in the cycle of rebirth

Compound type : bahuvrīhi (sa+saṃsṛti)

• sa – with, accompanied by, having
  indeclinable
• saṃsṛti – transmigration, cycle of rebirth, worldly existence (saṃsāra)
  noun (feminine)
  Prefix: sam
  Root: sṛ (class 1)

Note: Agrees with 'ahantā ātmā' (treating it as a unit)

अचेतना (acetanā) - unconscious, insentient, inert

(adjective)

Nominative, feminine, singular of acetana

acetana - unconscious, insentient, inanimate, inert

Compound type : tatpuruṣa (a+cetana)

• a – not, non, un-
  indeclinable
• cetana – conscious, intelligent, sentient, living
  adjective (masculine)
  Root: cit (class 1)

Note: Here in feminine form, potentially modifying an implied 'state' or adverbial

अनहन्त्वेन (anahantvena) - by non-ego-ness, by the absence of ego

(noun)

Instrumental, neuter, singular of anahantva

anahantva - non-ego-ness, absence of ego, non-individuality

Compound type : tatpuruṣa (a+ahantva)

• a – not, non, un-
  indeclinable
• ahantva – egoism, egoity, the state of being 'I'
  noun (neuter)
  Derived from 'ahan' (I) + 'tva' (suffix for abstract noun)

शाम्यति (śāmyati) - subsides, calms down, ceases, becomes quiet

(verb)

3rd person , singular, active, present (lat) of śam

Root: śam (class 4)

अस्पन्दवातवत् (aspandavātavat) - like a wind without vibration, like still wind

(adjective)

Nominative, masculine, singular of aspandavātavat

aspandavātavat - like a wind without movement/vibration, like still wind

Derived from 'a-spanda-vāta' (still wind) with the suffix '-vat' (like, as)

Compound type : tatpuruṣa (a+spanda+vāta+vat)

• a – not, non, un-
  indeclinable
• spanda – vibration, throb, movement
  noun (masculine)
  Root: spand (class 1)
• vāta – wind, air
  noun (masculine)
  Root: vā (class 2)
• vat – like, as, in the manner of
  indeclinable
  Suffix indicating similarity

Note: Used adverbially to modify 'śāmyati'