योगवासिष्ठः yogavāsiṣṭhaḥ - book-1, chapter-27, verse-4

यदा यदा पाकमुपैति नूनं तदा तदेयं रतिमातनोति ।
जराभराऽनल्पनवप्रसूना विजर्जरा कायलता नराणाम् ॥ ४ ॥

yadā yadā pākamupaiti nūnaṃ tadā tadeyaṃ ratimātanoti ,
jarābharā'nalpanavaprasūnā vijarjarā kāyalatā narāṇām 4

4. yadā yadā pākam upaiti nūnam tadā tadā iyam ratim ātanoti
jarābharaanlapana-vaprasūnā vijarjarā kāyalatā narāṇām

4. narāṇām vijarjarā jarābharaanlapana-vaprasūnā iyam kāyalatā
yadā yadā nūnam pākam upaiti tadā tadā ratim ātanoti

4. Whenever this body-creeper of people, which is decrepit and bears abundant new blossoms (symptoms) from the burden of old age, certainly reaches its full maturation, then it (the body) surely prolongs attachment (rati).

Words meanings summery:

• यदा (yadā) - when, whenever

• यदा (yadā) - when, whenever

• पाकम् (pākam) - maturity (of the body, i.e., aging) (maturity, ripeness, completion, cooking)

• उपैति (upaiti) - approaches, attains, reaches

• नूनम् (nūnam) - certainly, indeed, surely

• तदा (tadā) - then, at that time

• तदा (tadā) - then, at that time

• इयम् (iyam) - referring to the 'kāyalatā' (body-creeper) (this (feminine))

• रतिम् (ratim) - attachment (to worldly existence or to the body itself) (attachment, pleasure, delight)

• आतनोति (ātanoti) - extends, spreads, produces

• जराभरअन्लपन-वप्रसूना (jarābharaanlapana-vaprasūnā) - having abundant new blossoms (symptoms) from the burden of old age

• विजर्जरा (vijarjarā) - decrepit, greatly decayed, shattered

• कायलता (kāyalatā) - body-creeper (body compared to a creeper)

• नराणाम् (narāṇām) - of men, of people

Words meanings and morphology

यदा (yadā) - when, whenever

(indeclinable)

यदा (yadā) - when, whenever

(indeclinable)

पाकम् (pākam) - maturity (of the body, i.e., aging) (maturity, ripeness, completion, cooking)

(noun)

Accusative, masculine, singular of pāka

pāka - ripeness, maturity, cooking, digestion

from root pac (to cook, ripen)

Root: pac (class 1)

Note: Object of 'upaiti'.

उपैति (upaiti) - approaches, attains, reaches

(verb)

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

Present Active

from upa- (prefix) + root i (to go)

Prefix: upa

Root: i (class 2)

नूनम् (nūnam) - certainly, indeed, surely

(indeclinable)

तदा (tadā) - then, at that time

(indeclinable)

Root: tad

तदा (tadā) - then, at that time

(indeclinable)

Root: tad

इयम् (iyam) - referring to the 'kāyalatā' (body-creeper) (this (feminine))

(pronoun)

Nominative, feminine, singular of idam

idam - this

Note: Refers to 'kāyalatā'.

रतिम् (ratim) - attachment (to worldly existence or to the body itself) (attachment, pleasure, delight)

(noun)

Accusative, feminine, singular of rati

rati - pleasure, delight, attachment, love

from root ram (to delight)

Root: ram (class 1)

Note: Object of 'ātanoti'.

आतनोति (ātanoti) - extends, spreads, produces

(verb)

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

Present Active

from ā- (prefix) + root tan (to stretch)

Prefix: ā

Root: tan (class 8)

जराभरअन्लपन-वप्रसूना (jarābharaanlapana-vaprasūnā) - having abundant new blossoms (symptoms) from the burden of old age

(adjective)

Nominative, feminine, singular of jarābharaanlapana-vaprasūna

jarābharaanlapana-vaprasūna - having many new blossoms/symptoms (of decay) due to the burden of old age

Compound type : bahuvrihi (jarābhara+analpa+nava+prasūna)

• jarābhara – burden of old age
  noun (masculine)
• analpa – not small, abundant, many
  adjective
  negated 'alpa'
  Prefix: an
• nava – new, fresh
  adjective
• prasūna – flower, blossom (metaphor for symptoms of decay)
  noun (neuter)
  from pra- (prefix) + root sū (to produce)
  Prefix: pra
  Root: sū (class 2)

Note: Adjective modifying 'kāyalatā'.

विजर्जरा (vijarjarā) - decrepit, greatly decayed, shattered

(adjective)

Nominative, feminine, singular of vijarjarā

vijarjarā - decrepit, decayed, shattered

from vi- (intensive prefix) + jarjara (decrepit)

Prefix: vi

Root: jṝ

Note: Adjective modifying 'kāyalatā'.

कायलता (kāyalatā) - body-creeper (body compared to a creeper)

(noun)

Nominative, feminine, singular of kāyalatā

kāyalatā - body-creeper

Compound type : karmadhāraya (kāya+latā)

• kāya – body
  noun (masculine)
  from root ci (to heap up)
  Root: ci (class 5)
• latā – creeper, vine
  noun (feminine)
  Root: lat

Note: Subject of the sentence.

नराणाम् (narāṇām) - of men, of people

(noun)

Genitive, masculine, plural of nara

nara - man, human being, person

Root: nṛ

Note: Possessive, 'of people'.