योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-178, verse-10

बाह्योपस्करभस्त्रायां यथाकाशास्पदात्मकः ।
वायुर्यात्यपि चायाति तथात्र स्पन्दनं हृदि ॥ १० ॥

bāhyopaskarabhastrāyāṃ yathākāśāspadātmakaḥ ,
vāyuryātyapi cāyāti tathātra spandanaṃ hṛdi 10

10. bāhya upaskara bhastrāyām yathā ākāśāspadātmakaḥ
vāyuḥ yāti api ca āyāti tathā atra spandanam hṛdi

10. yathā ākāśāspadātmakaḥ vāyuḥ bāhya upaskara bhastrāyām yāti ca api āyāti,
tathā atra hṛdi spandanam

10. Just as air (vāyu), which inherently resides in space, moves in and out of an external bellows, similarly, here in the heart there is pulsation.

Words meanings summery:

• बाह्योपस्करभस्त्रायाम् (bāhyopaskarabhastrāyām) - in an external bellows

• यथा (yathā) - just as, as

• आकाशास्पदात्मकः (ākāśāspadātmakaḥ) - of the nature of residing in space, space-abiding by nature

• वायुः (vāyuḥ) - air, vital current (vāyu) (air, wind, vital air)

• याति (yāti) - goes, moves

• अपि (api) - also, even, too

• च (ca) - and, also

• आयाति (āyāti) - comes, returns

• तथा (tathā) - similarly, so, thus

• अत्र (atra) - here, in this (context)

• स्पन्दनम् (spandanam) - vibration, pulsation, throbbing

• हृदि (hṛdi) - in the heart

Words meanings and morphology

बाह्योपस्करभस्त्रायाम् (bāhyopaskarabhastrāyām) - in an external bellows

(noun)

Locative, feminine, singular of bāhyopaskarabhastrā

bāhyopaskarabhastrā - external bellows

Compound type : tatpurusha (bāhya+upaskara+bhastrā)

• bāhya – outer, external
  adjective
  From bahir (outside) + ya (suffix)
• upaskara – tool, implement, apparatus
  noun (masculine)
  From upa- + kṛ (to do)
  Prefix: upa
  Root: kṛ (class 8)
• bhastrā – bellows, leather bag
  noun (feminine)

Note: Indicates location.

यथा (yathā) - just as, as

(indeclinable)

Note: Introduces a simile.

आकाशास्पदात्मकः (ākāśāspadātmakaḥ) - of the nature of residing in space, space-abiding by nature

(adjective)

Nominative, masculine, singular of ākāśāspadātmaka

ākāśāspadātmaka - of the nature of residing in space, space-abiding by nature

Compound type : tatpurusha (ākāśa+āspada+ātmaka)

• ākāśa – space, ether, sky
  noun (masculine)
  Root: kāś (class 1)
• āspada – place, seat, abode, subject
  noun (neuter)
  From ā- + sad (to sit)
  Prefix: ā
  Root: sad (class 1)
• ātmaka – of the nature of, consisting of, pertaining to the self (ātman)
  adjective
  From ātman + -ka

Note: Qualifies 'vāyuḥ'.

वायुः (vāyuḥ) - air, vital current (vāyu) (air, wind, vital air)

(noun)

Nominative, masculine, singular of vāyu

vāyu - air, wind, vital air, one of the five elements

From vā (to blow)

Root: vā (class 2)

Note: Subject of 'yāti' and 'āyāti'.

याति (yāti) - goes, moves

(verb)

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

Present tense, 3rd person singular, active voice.

Root: yā (class 2)

Note: Paired with 'āyāti'.

अपि (api) - also, even, too

(indeclinable)

Note: Emphasizes the coming and going.

च (ca) - and, also

(indeclinable)

Note: Connects the two verbs.

आयाति (āyāti) - comes, returns

(verb)

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

Present tense, 3rd person singular, active voice. Root 'yā' with prefix 'ā'.

Prefix: ā

Root: yā (class 2)

Note: Paired with 'yāti'.

तथा (tathā) - similarly, so, thus

(indeclinable)

Note: Introduces the second part of the simile.

अत्र (atra) - here, in this (context)

(indeclinable)

Note: Refers to 'hṛdi'.

स्पन्दनम् (spandanam) - vibration, pulsation, throbbing

(noun)

Nominative, neuter, singular of spandana

spandana - vibration, pulsation, throbbing, movement

From spand (to throb, vibrate)

Root: spand (class 1)

Note: Subject of an implied 'is'.

हृदि (hṛdi) - in the heart

(noun)

Locative, neuter, singular of hṛd

hṛd - heart, mind, essence

Locative singular of 'hṛd' (heart)

Note: Location of the pulsation.