योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-25, verse-35

मुखाग्रगगनं पश्चात्तापयत्युत्तमो रविः ।
अपानेन्दुर्मुखाग्रं तु प्लावयित्वा हृदम्बरम् ॥ ३५ ॥

mukhāgragaganaṃ paścāttāpayatyuttamo raviḥ ,
apānendurmukhāgraṃ tu plāvayitvā hṛdambaram 35

35. mukhāgragaganam paścāt tāpayati uttamaḥ raviḥ
apānenduḥ mukhāgram tu plāvayitvā hṛdambaram

35. paścāt uttamaḥ raviḥ mukhāgragaganam tāpayati
apānenduḥ tu mukhāgram plāvayitvā hṛdambaram

35. subsequently heats the space at the tip of the mouth/face, like the supreme sun. Conversely, apāna (life-force), like the moon, having moistened the tip of the mouth/face, then moistens the heart-space.

Words meanings summery:

• मुखाग्रगगनम् (mukhāgragaganam) - the space at the tip of the mouth/face

• पश्चात् (paścāt) - afterwards, behind, subsequently

• तापयति (tāpayati) - heats, causes to burn

• उत्तमः (uttamaḥ) - supreme, excellent, highest

• रविः (raviḥ) - sun

• अपानेन्दुः (apānenduḥ) - apāna as the moon

• मुखाग्रम् (mukhāgram) - the tip of the mouth/face

• तु (tu) - but, on the other hand, indeed

• प्लावयित्वा (plāvayitvā) - having caused to float, having moistened, having filled

• हृदम्बरम् (hṛdambaram) - heart-space, the space of the heart

Words meanings and morphology

मुखाग्रगगनम् (mukhāgragaganam) - the space at the tip of the mouth/face

(noun)

Accusative, neuter, singular of mukhāgragagana

mukhāgragagana - the space at the tip of the mouth/face

Compound type : tatpuruṣa (mukha+agra+gagana)

• mukha – mouth, face
  noun (neuter)
• agra – tip, front, top
  noun (neuter)
• gagana – sky, atmosphere, space
  noun (neuter)

पश्चात् (paścāt) - afterwards, behind, subsequently

(indeclinable)

तापयति (tāpayati) - heats, causes to burn

(verb)

3rd person , singular, active, present indicative (laṭ) of tāpay

Causative

Causative stem of √tap (to heat, to burn).

Root: tap (class 1)

उत्तमः (uttamaḥ) - supreme, excellent, highest

(adjective)

Nominative, masculine, singular of uttama

uttama - supreme, excellent, highest, best

रविः (raviḥ) - sun

(noun)

Nominative, masculine, singular of ravi

ravi - sun, sun-god

अपानेन्दुः (apānenduḥ) - apāna as the moon

(noun)

Nominative, masculine, singular of apānendu

apānendu - apāna which is like the moon

Compound type : karmadhāraya (apāna+indu)

• apāna – downward-moving vital air (apāna)
  noun (masculine)
• indu – moon
  noun (masculine)

मुखाग्रम् (mukhāgram) - the tip of the mouth/face

(noun)

Accusative, neuter, singular of mukhāgra

mukhāgra - the tip of the mouth/face

Compound type : tatpuruṣa (mukha+agra)

• mukha – mouth, face
  noun (neuter)
• agra – tip, front, top
  noun (neuter)

तु (tu) - but, on the other hand, indeed

(indeclinable)

प्लावयित्वा (plāvayitvā) - having caused to float, having moistened, having filled

(indeclinable)

Absolutive (gerund)

Formed from the causative stem of √plu (to float, to swim).

Root: plu (class 1)

हृदम्बरम् (hṛdambaram) - heart-space, the space of the heart

(noun)

Accusative, neuter, singular of hṛdambara

hṛdambara - heart-space, the space of the heart

Compound type : karmadhāraya (hṛd+ambara)

• hṛd – heart
  noun (neuter)
• ambara – sky, atmosphere, space, garment
  noun (neuter)