योगवासिष्ठः yogavāsiṣṭhaḥ - book-1, chapter-22, verse-18

क्षणान्निगरणायैव कासक्वणितकारिणी ।
गृध्रीवामिषमादत्ते तरसैव नरं जरा ॥ १८ ॥

kṣaṇānnigaraṇāyaiva kāsakvaṇitakāriṇī ,
gṛdhrīvāmiṣamādatte tarasaiva naraṃ jarā 18

18. kṣaṇāt nigaraṇāya eva kāsakvaṇitakāriṇī gṛdhrī
iva āmiṣam ādatte tarasā eva naram jarā

18. jarā kāsakvaṇitakāriṇī gṛdhrī iva,
āmiṣam nigaraṇāya eva,
naram tarasā eva kṣaṇāt ādatte

18. Just as a female vulture, making a crackling sound, seizes its prey (flesh) instantly just for swallowing, so too does old age swiftly overpower a man.

Words meanings summery:

• क्षणात् (kṣaṇāt) - from a moment, in an instant, instantly

• निगरणाय (nigaraṇāya) - for swallowing, for devouring

• एव (eva) - only, just, indeed, very

• कासक्वणितकारिणी (kāsakvaṇitakāriṇī) - making a cough-like sound, causing a crackling sound

• गृध्री (gṛdhrī) - female vulture

• इव (iva) - like, as, as if

• आमिषम् (āmiṣam) - flesh, meat, prey

• आदत्ते (ādatte) - takes, seizes, receives

• तरसा (tarasā) - with speed, quickly, forcibly

• एव (eva) - only, just, indeed, very

• नरम् (naram) - man

• जरा (jarā) - old age, decrepitude

Words meanings and morphology

क्षणात् (kṣaṇāt) - from a moment, in an instant, instantly

(noun)

Ablative, masculine, singular of kṣaṇa

kṣaṇa - a moment, instant, twinkling of an eye

निगरणाय (nigaraṇāya) - for swallowing, for devouring

(noun)

Dative, neuter, singular of nigaraṇa

nigaraṇa - swallowing, devouring

Prefix: ni

Root: gṛ (class 6)

एव (eva) - only, just, indeed, very

(indeclinable)

कासक्वणितकारिणी (kāsakvaṇitakāriṇī) - making a cough-like sound, causing a crackling sound

(adjective)

Nominative, feminine, singular of kāsakvaṇitakāriṇī

kāsakvaṇitakāriṇī - making a sound like a cough or a crackle

Compound type : tatpurusha (kāsa+kvaṇita+kāriṇī)

• kāsa – cough, coughing sound
  noun (masculine)
• kvaṇita – sound, ringing, tinkling, crackling (past passive participle of kvaṇ)
  adjective (neuter)
  Past Passive Participle
  From root kvaṇ 'to sound', suffix -ta
  Root: kvaṇ (class 1)
• kāriṇī – doing, making, causing (feminine form of kārin)
  adjective (feminine)
  Root: kṛ (class 8)

Note: Qualifies 'jarā' (old age) and 'gṛdhrī' (vulture) by implication in simile.

गृध्री (gṛdhrī) - female vulture

(noun)

Nominative, feminine, singular of gṛdhrī

gṛdhrī - a female vulture, a greedy woman

Feminine of gṛdhra (vulture)

इव (iva) - like, as, as if

(indeclinable)

आमिषम् (āmiṣam) - flesh, meat, prey

(noun)

Accusative, neuter, singular of āmiṣa

āmiṣa - flesh, meat, prey, lure, object of desire

आदत्ते (ādatte) - takes, seizes, receives

(verb)

3rd person , singular, middle, present (laṭ) of ādatte

Root dā (to give) with prefix ā (towards), meaning 'to take'

Prefix: ā

Root: dā (class 3)

तरसा (tarasā) - with speed, quickly, forcibly

(noun)

Instrumental, neuter, singular of taras

taras - speed, velocity, quickness, force

एव (eva) - only, just, indeed, very

(indeclinable)

नरम् (naram) - man

(noun)

Accusative, masculine, singular of nara

nara - man, male, human being

जरा (jarā) - old age, decrepitude

(noun)

Nominative, feminine, singular of jarā

jarā - old age, decrepitude, decay