योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-137, verse-20

मिलत्पदार्थनीरन्ध्रं सितमच्छं सवायुभिः ।
क्वचित्सौम्यं क्वचित्क्षुब्धं चोरैरिव पुरं निशि ॥ २० ॥

milatpadārthanīrandhraṃ sitamacchaṃ savāyubhiḥ ,
kvacitsaumyaṃ kvacitkṣubdhaṃ corairiva puraṃ niśi 20

20. milatpadārthanīrandhram sitamaccham sa-vāyubhiḥ
kvacit saumyam kvacit kṣubdham coraiḥ iva puram niśi

20. milatpadārthanīrandhram sitamaccham sa-vāyubhiḥ
kvacit saumyam kvacit kṣubdham puram coraiḥ iva niśi

20. Dense and compact with combining elements, white and clear, accompanied by its vital airs (vāyu), sometimes tranquil and sometimes agitated, like a city (pura) at night [disturbed] by thieves.

Words meanings summery:

• मिलत्पदार्थनीरन्ध्रम् (milatpadārthanīrandhram) - dense with combining substances/elements

• सितमच्छम् (sitamaccham) - white and clear, pure and distinct

• स-वायुभिः (sa-vāyubhiḥ) - with the vital airs (vāyu), accompanied by its winds

• क्वचित् (kvacit) - sometimes, at times, in some place

• सौम्यम् (saumyam) - tranquil, gentle, mild, benevolent, lunar

• क्वचित् (kvacit) - sometimes, at times, in some place

• क्षुब्धम् (kṣubdham) - agitated, disturbed, stirred up, troubled

• चोरैः (coraiḥ) - by thieves

• इव (iva) - like, as, as if

• पुरम् (puram) - body (in a philosophical/medical context) (city, town, body, abode)

• निशि (niśi) - at night, in the night

Words meanings and morphology

मिलत्पदार्थनीरन्ध्रम् (milatpadārthanīrandhram) - dense with combining substances/elements

(adjective)

Nominative, neuter, singular of milatpadārthanīrandhra

milatpadārthanīrandhra - dense with combining substances

Compound type : bahuvrīhi (milat+padārtha+nīrandhra)

• milat – joining, meeting, combining, adhering, coalescing
  adjective
  Present Active Participle
  Derived from root mil
  Root: mil (class 6)
• padārtha – object, thing, substance, element, category
  noun (masculine)
• nīrandhra – dense, compact, solid, without interstices, impenetrable
  adjective

Note: Adjective modifying an implied neuter subject.

सितमच्छम् (sitamaccham) - white and clear, pure and distinct

(adjective)

Nominative, neuter, singular of sitamaccha

sitamaccha - white and clear

Compound type : karmadhāraya (sita+accha)

• sita – white, clear, pure, bright
  adjective
  Past Passive Participle
  Derived from root śī (to bind, also used to mean white)
  Root: śī
• accha – clear, transparent, pure, brilliant
  adjective

Note: Adjective modifying an implied neuter subject.

स-वायुभिः (sa-vāyubhiḥ) - with the vital airs (vāyu), accompanied by its winds

(adjective)

Instrumental, plural of sa-vāyu

sa-vāyu - accompanied by wind/vital airs

Compound type : bahuvrīhi (sa+vāyu)

• sa – with, accompanied by
  indeclinable
• vāyu – wind, air, vital air (prāṇa)
  noun (masculine)

Note: An adjective in instrumental plural, describing the state of the implied subject.

क्वचित् (kvacit) - sometimes, at times, in some place

(indeclinable)

सौम्यम् (saumyam) - tranquil, gentle, mild, benevolent, lunar

(adjective)

Nominative, neuter, singular of saumya

saumya - tranquil, gentle, mild, benevolent, related to Soma/Moon

Note: Adjective modifying an implied neuter subject.

क्वचित् (kvacit) - sometimes, at times, in some place

(indeclinable)

क्षुब्धम् (kṣubdham) - agitated, disturbed, stirred up, troubled

(adjective)

Nominative, neuter, singular of kṣubdha

kṣubdha - agitated, disturbed, stirred up

Past Passive Participle

Derived from root kṣubh (class 4)

Root: kṣubh (class 4)

Note: Adjective modifying an implied neuter subject.

चोरैः (coraiḥ) - by thieves

(noun)

Instrumental, masculine, plural of cora

cora - thief, robber

इव (iva) - like, as, as if

(indeclinable)

Note: Particle of comparison.

पुरम् (puram) - body (in a philosophical/medical context) (city, town, body, abode)

(noun)

Nominative, neuter, singular of pura

pura - city, town, fortress, body

निशि (niśi) - at night, in the night

(noun)

Locative, feminine, singular of niś

niś - night