योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-91, verse-18

प्राणस्पन्दनसुप्ता च तच्छान्तिं शान्तिरुच्यते ।
प्राणसंस्पन्दनात्संविद्याति वीटेव चोदिता ॥ १८ ॥

prāṇaspandanasuptā ca tacchāntiṃ śāntirucyate ,
prāṇasaṃspandanātsaṃvidyāti vīṭeva coditā 18

18. prāṇaspandanasuptā ca tat śāntim śāntiḥ ucyate
| prāṇasaṃspandanāt saṃvit yāti vīṭā iva coditā

18. ca prāṇaspandanasuptā tat śāntim śāntiḥ ucyate
prāṇasaṃspandanāt coditā vīṭā iva saṃvit yāti

18. And that state where the vibration of the life-force (prāṇa) is dormant is called true tranquility (śānti). Consciousness (saṃvit) manifests from the movement of the life-force (prāṇa), like a swing set into motion.

Words meanings summery:

• प्राणस्पन्दनसुप्ता (prāṇaspandanasuptā) - asleep due to the vibration of life-force, dormant in the movement of prāṇa

• च (ca) - and, also

• तत् (tat) - that

• शान्तिम् (śāntim) - peace, tranquility, cessation

• शान्तिः (śāntiḥ) - peace, tranquility, cessation

• उच्यते (ucyate) - is called, is said, is declared

• प्राणसंस्पन्दनात् (prāṇasaṁspandanāt) - from the vibration of life-force (prāṇa), due to the movement of prāṇa

• संवित् (saṁvit) - consciousness, knowledge, intelligence

• याति (yāti) - goes, moves, proceeds, manifests

• वीटा (vīṭā) - a swing

• इव (iva) - like, as if

• चोदिता (coditā) - impelled, set in motion, urged

Words meanings and morphology

प्राणस्पन्दनसुप्ता (prāṇaspandanasuptā) - asleep due to the vibration of life-force, dormant in the movement of prāṇa

(adjective)

Nominative, feminine, singular of prāṇaspandanasupta

prāṇaspandanasupta - dormant in the vibration of life-force (prāṇa), asleep due to prāṇa's movement

Compound type : bahuvrihi (prāṇa+spandana+supta)

• prāṇa – life-force, vital breath, respiration
  noun (masculine)
• spandana – vibration, trembling, movement
  noun (neuter)
  Derived from root spand (to tremble, vibrate)
  Root: spand (class 1)
• supta – asleep, dormant, slumbering
  adjective (neuter)
  Past Passive Participle
  From root svap (to sleep)
  Root: svap (class 2)

Note: Agrees with 'śāntiḥ'

च (ca) - and, also

(indeclinable)

तत् (tat) - that

(pronoun)

Accusative, feminine, singular of tad

tad - that, he, she, it

Note: Agrees with 'śāntim'.

शान्तिम् (śāntim) - peace, tranquility, cessation

(noun)

Accusative, feminine, singular of śānti

śānti - peace, tranquility, calmness, cessation, absence of passion

Derived from root śam (to be calm)

Root: śam (class 4)

Note: Object of 'ucyate' (understood as "that which is called peace").

शान्तिः (śāntiḥ) - peace, tranquility, cessation

(noun)

Nominative, feminine, singular of śānti

śānti - peace, tranquility, calmness, cessation, absence of passion

Derived from root śam (to be calm)

Root: śam (class 4)

Note: Subject of 'ucyate'.

उच्यते (ucyate) - is called, is said, is declared

(verb)

3rd person , singular, passive, present (laṭ) of vac

present passive

Passive formation of root vac; the root changes to uc in passive.

Root: vac (class 2)

प्राणसंस्पन्दनात् (prāṇasaṁspandanāt) - from the vibration of life-force (prāṇa), due to the movement of prāṇa

(noun)

Ablative, neuter, singular of prāṇasaṃspandana

prāṇasaṁspandana - vibration of life-force (prāṇa), agitation of vital breath

Compound type : tatpurusha (prāṇa+saṃspandana)

• prāṇa – life-force, vital breath, respiration
  noun (masculine)
• saṃspandana – vibration, agitation, oscillation
  noun (neuter)
  Derived from root spand (to tremble) with prefix sam-
  Prefix: sam
  Root: spand (class 1)

संवित् (saṁvit) - consciousness, knowledge, intelligence

(noun)

Nominative, feminine, singular of saṃvit

saṁvit - consciousness, knowledge, understanding, intelligence

Derived from root vid (to know) with prefix sam-

Prefix: sam

Root: vid (class 2)

याति (yāti) - goes, moves, proceeds, manifests

(verb)

3rd person , singular, active, present (laṭ) of yā

present active

Root: yā (class 2)

वीटा (vīṭā) - a swing

(noun)

Nominative, feminine, singular of vīṭā

vīṭā - swing, hammock

इव (iva) - like, as if

(indeclinable)

चोदिता (coditā) - impelled, set in motion, urged

(adjective)

Nominative, feminine, singular of codita

codita - impelled, prompted, driven, set in motion

Past Passive Participle

From causal root cud (to impel, urge)

Root: cud (class 10)