योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-36, verse-49

ब्रह्माण्डकोटराध्वान्ताः प्राणापानपरैस्त्वया ।
गतागतैर्ब्रह्मपुरे संप्रेक्ष्यन्ते प्रतिक्षणम् ॥ ४९ ॥

brahmāṇḍakoṭarādhvāntāḥ prāṇāpānaparaistvayā ,
gatāgatairbrahmapure saṃprekṣyante pratikṣaṇam 49

49. brahmāṇḍakoṭarādhvāntāḥ prāṇāpānaparaiḥ tvayā
gatāgataiḥ brahmapure samprekṣyante pratikṣaṇam

49. tvayā prāṇāpānaparaiḥ gatāgataiḥ brahmapure
brahmāṇḍakoṭarādhvāntāḥ pratikṣaṇam samprekṣyante

49. By you (the self), who are intent on the vital breaths (prāṇa and apāna), and through their continuous coming and going, the obscurities within the cosmic cavities of the universe are perceived moment by moment within the city of Brahman (brahmapura).

Words meanings summery:

• ब्रह्माण्डकोटराध्वान्ताः (brahmāṇḍakoṭarādhvāntāḥ) - the darknesses within the cavities of the universe

• प्राणापानपरैः (prāṇāpānaparaiḥ) - by those devoted to prāṇa and apāna; by those engaged in prāṇa and apāna

• त्वया (tvayā) - by you

• गतागतैः (gatāgataiḥ) - by comings and goings; by movements to and fro

• ब्रह्मपुरे (brahmapure) - the body as an abode (brahmapura) (in the city of Brahman; in the divine city)

• सम्प्रेक्ष्यन्ते (samprekṣyante) - are seen; are observed; are perceived

• प्रतिक्षणम् (pratikṣaṇam) - moment by moment; at every moment

Words meanings and morphology

ब्रह्माण्डकोटराध्वान्ताः (brahmāṇḍakoṭarādhvāntāḥ) - the darknesses within the cavities of the universe

(noun)

Nominative, masculine, plural of brahmāṇḍakoṭarādhvānta

brahmāṇḍakoṭarādhvānta - darkness in the hollows of the universe

Compound type : tatpuruṣa (brahmāṇḍa+koṭara+adhvānta)

• brahmāṇḍa – universe, Brahma's egg
  noun (neuter)
• koṭara – cavity, hollow, hole
  noun (neuter)
• adhvānta – darkness, obscurity
  noun (neuter)

प्राणापानपरैः (prāṇāpānaparaiḥ) - by those devoted to prāṇa and apāna; by those engaged in prāṇa and apāna

(adjective)

Instrumental, masculine, plural of prāṇāpānapara

prāṇāpānapara - intent on prāṇa and apāna

Compound type : bahuvrīhi (prāṇa+apāna+para)

• prāṇa – in-breath, vital breath
  noun (masculine)
• apāna – out-breath, vital breath
  noun (masculine)
• para – devoted to, intent on, supreme, other
  adjective (masculine)

त्वया (tvayā) - by you

(pronoun)

Instrumental, singular of yuṣmad

yuṣmad - you

गतागतैः (gatāgataiḥ) - by comings and goings; by movements to and fro

(noun)

Instrumental, masculine, plural of gatāgata

gatāgata - coming and going, moving to and fro

Compound type : dvandva (gata+āgata)

• gata – gone, past
  participle (masculine)
  Past Passive Participle
  Derived from root gam- (to go)
  Root: gam (class 1)
• āgata – come, arrived
  participle (masculine)
  Past Passive Participle
  Derived from root gam- (to go) with prefix ā-
  Prefix: ā
  Root: gam (class 1)

ब्रह्मपुरे (brahmapure) - the body as an abode (brahmapura) (in the city of Brahman; in the divine city)

(noun)

Locative, neuter, singular of brahmapura

brahmapura - city of Brahman; abode of Brahma; the body as an abode (brahmapura)

Compound type : ṣaṣṭhī-tatpuruṣa (brahman+pura)

• brahman – Brahman, the Absolute, sacred knowledge
  noun (neuter)
• pura – city, fortress, abode
  noun (neuter)

सम्प्रेक्ष्यन्ते (samprekṣyante) - are seen; are observed; are perceived

(verb)

3rd person , plural, passive, present (laṭ) of samprekṣ

Prefixes: sam+pra

Root: īkṣ (class 1)

प्रतिक्षणम् (pratikṣaṇam) - moment by moment; at every moment

(indeclinable)

Adverbial form derived from prati + kṣaṇa

Compound type : avyayībhāva (prati+kṣaṇa)

• prati – towards, against, every
  indeclinable
• kṣaṇa – moment, instant
  noun (neuter)