योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-74, verse-9

जगद्यज्ञोपवीतस्य स्वर्गपातालवाहिनः ।
गङ्गावाहस्य येनास्यां तृतीयः पूरितो गुणः ॥ ९ ॥

jagadyajñopavītasya svargapātālavāhinaḥ ,
gaṅgāvāhasya yenāsyāṃ tṛtīyaḥ pūrito guṇaḥ 9

9. jagadyajñopavītasya svargapātālavāhinaḥ
gaṅgāvāhasya yena asyām tṛtīyaḥ pūritaḥ guṇaḥ

9. yena asyām jagadyajñopavītasya svargapātālavāhinaḥ
gaṅgāvāhasya tṛtīyaḥ guṇaḥ pūritaḥ

9. By whom (Bhagīratha), the third strand was completed for the flow of the Gaṅgā, which is like the sacred thread (yajñopavīta) for the world, flowing through heaven and the underworld.

Words meanings summery:

• जगद्यज्ञोपवीतस्य (jagadyajñopavītasya) - of the sacred thread of the world

• स्वर्गपातालवाहिनः (svargapātālavāhinaḥ) - of the one flowing through heaven and the underworld

• गङ्गावाहस्य (gaṅgāvāhasya) - of the flow of the Gaṅgā

• येन (yena) - by Bhagīratha (by whom, by which)

• अस्याम् (asyām) - in this (Gaṅgā or earth) (in her, in this)

• तृतीयः (tṛtīyaḥ) - third

• पूरितः (pūritaḥ) - filled, completed

• गुणः (guṇaḥ) - quality, characteristic, strand

Words meanings and morphology

जगद्यज्ञोपवीतस्य (jagadyajñopavītasya) - of the sacred thread of the world

(noun)

Genitive, neuter, singular of jagadyajñopavīta

jagadyajñopavīta - the sacred thread of the world

Compound type : ṣaṣṭhī-tatpuruṣa (jagat+yajñopavīta)

• jagat – world
  noun (neuter)
• yajñopavīta – sacred thread (yajñopavīta), sacrificial cord
  noun (neuter)

स्वर्गपातालवाहिनः (svargapātālavāhinaḥ) - of the one flowing through heaven and the underworld

(adjective)

Genitive, masculine, singular of svargapātālavāhin

svargapātālavāhin - flowing through heaven and the underworld

Compound type : karmadhāraya (svargapātāla+vāhin)

• svargapātāla – heaven and the underworld
  noun (masculine)
• vāhin – flowing, carrying, bearing
  adjective (masculine)
  agent noun suffix (ṇini)
  Derived from root √vah (to carry, flow) with the suffix -in.
  Root: vah (class 1)

गङ्गावाहस्य (gaṅgāvāhasya) - of the flow of the Gaṅgā

(noun)

Genitive, masculine, singular of gaṅgāvāha

gaṅgāvāha - flow of the Gaṅgā

Compound type : ṣaṣṭhī-tatpuruṣa (gaṅgā+vāha)

• gaṅgā – the river Gaṅgā
  proper noun (feminine)
• vāha – flow, current, stream
  noun (masculine)
  Root: vah (class 1)

येन (yena) - by Bhagīratha (by whom, by which)

(pronoun)

Instrumental, masculine, singular of yad

yad - who, which, what

अस्याम् (asyām) - in this (Gaṅgā or earth) (in her, in this)

(pronoun)

Locative, feminine, singular of idam

idam - this, she

तृतीयः (tṛtīyaḥ) - third

(adjective)

Nominative, masculine, singular of tṛtīya

tṛtīya - third

पूरितः (pūritaḥ) - filled, completed

(adjective)

Nominative, masculine, singular of pūrita

pūrita - filled, completed

Past Passive Participle

Past Passive Participle of the root pṛ (to fill).

Root: pṛ (class 3)

गुणः (guṇaḥ) - quality, characteristic, strand

(noun)

Nominative, masculine, singular of guṇa

guṇa - quality, virtue, attribute, constituent (of prakṛti), strand (of a cord)