योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-1, verse-20

बोधार्कपीतरसया स्पन्दन् षड्वर्गसत्तया ।
यन्त्रस्पन्दोपमस्तिष्ठ वल्ल्येव शिशिरे द्रुमः ॥ २० ॥

bodhārkapītarasayā spandan ṣaḍvargasattayā ,
yantraspandopamastiṣṭha vallyeva śiśire drumaḥ 20

20. bodhārkapītarasayā spandan ṣaḍvargasattayā |
yantraspandopamaḥ tiṣṭha vallī iva śiśire drumaḥ ||

20. (tvam) ṣaḍvargasattayā spandan,
yantraspandopamaḥ tiṣṭha.
bodhārkapītarasayā vallī iva śiśire drumaḥ [tiṣṭha].

20. Remain like the pulse of a machine, even as you operate (spandan) by the power of the six internal adversaries (ṣaḍvarga). Be like a tree in the winter season (śiśira), resembling a creeper (vallī) whose vital essence (rasa) has been absorbed by the sun of spiritual awakening (bodhārka).

Words meanings summery:

• बोधार्कपीतरसया (bodhārkapītarasayā) - by (a creeper/tree) whose vital essence has been dried up by the sun of spiritual knowledge (by (that) whose essence has been drunk by the sun of awakening/knowledge)

• स्पन्दन् (spandan) - operating, functioning, engaging in activity (vibrating, throbbing, moving, operating)

• षड्वर्गसत्तया (ṣaḍvargasattayā) - by the influence or inherent activity of the six internal adversaries (lust, anger, greed, delusion, pride, envy) (by the reality/power/existence of the sixfold group)

• यन्त्रस्पन्दोपमः (yantraspandopamaḥ) - like the mechanical, dispassionate movement of a machine (similar to the throbbing/vibration of a machine)

• तिष्ठ (tiṣṭha) - maintain this state of being (remain, stand, stay)

• वल्ली (vallī) - vine, creeper

• इव (iva) - like, as if, similar to

• शिशिरे (śiśire) - in the winter season, in cold weather

• द्रुमः (drumaḥ) - tree

Words meanings and morphology

बोधार्कपीतरसया (bodhārkapītarasayā) - by (a creeper/tree) whose vital essence has been dried up by the sun of spiritual knowledge (by (that) whose essence has been drunk by the sun of awakening/knowledge)

(adjective)

Instrumental, feminine, singular of bodhārkapītarasā

bodhārkapītarasā - having its essence (rasa) absorbed by the sun of knowledge (bodhārka)

Compound type : bahuvrīhi (bodhārkapīta+rasa)

• bodhārkapīta – absorbed/drunk by the sun of awakening
  adjective (masculine)
• rasa – essence, sap, taste, sentiment
  noun (masculine)
  Root: ras (class 1)

Note: Agrees with an implied feminine noun, likely 'vallī' (creeper).

स्पन्दन् (spandan) - operating, functioning, engaging in activity (vibrating, throbbing, moving, operating)

(verbal derivative)

Note: Agrees with the implied subject 'you' (tvam).

षड्वर्गसत्तया (ṣaḍvargasattayā) - by the influence or inherent activity of the six internal adversaries (lust, anger, greed, delusion, pride, envy) (by the reality/power/existence of the sixfold group)

(noun)

Instrumental, feminine, singular of ṣaḍvargasattā

ṣaḍvargasattā - the existence or reality of the sixfold group

Compound type : tatpuruṣa (ṣaḍvarga+sattā)

• ṣaḍvarga – the sixfold group/class
  noun (masculine)
• sattā – existence, reality, being, power
  noun (feminine)
  Root: as (class 2)

यन्त्रस्पन्दोपमः (yantraspandopamaḥ) - like the mechanical, dispassionate movement of a machine (similar to the throbbing/vibration of a machine)

(adjective)

Nominative, masculine, singular of yantraspandopama

yantraspandopama - resembling the motion/vibration of a machine

Compound type : bahuvrīhi (yantraspanda+upama)

• yantraspanda – the throbbing/movement of a machine
  noun (masculine)
• upama – likeness, similarity, comparable
  adjective/noun (masculine)

Note: Agrees with the implied subject 'you' (tvam).

तिष्ठ (tiṣṭha) - maintain this state of being (remain, stand, stay)

(verb)

2nd person , singular, active, imperative (loṭ) of sthā

Root: sthā (class 1)

वल्ली (vallī) - vine, creeper

(noun)

Nominative, feminine, singular of vallī

vallī - creeper, vine

Note: Part of the simile for 'drumaḥ'.

इव (iva) - like, as if, similar to

(indeclinable)

शिशिरे (śiśire) - in the winter season, in cold weather

(noun)

Locative, masculine, singular of śiśira

śiśira - cool, cold, the winter season

Root: śī

Note: Refers to the setting of the simile.

द्रुमः (drumaḥ) - tree

(noun)

Nominative, masculine, singular of druma

druma - tree

Root: dru

Note: Subject of the implied verb 'be' (asti/bhavati).