योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-76, verse-13

भगीरथेन च महीमवतारयितुं दिवः ।
गङ्गां गृहीतो नियमस्ततःप्रभृति भूभृता ॥ १३ ॥

bhagīrathena ca mahīmavatārayituṃ divaḥ ,
gaṅgāṃ gṛhīto niyamastataḥprabhṛti bhūbhṛtā 13

13. bhagīrathena ca mahīm avatārayitum divaḥ
gaṅgām gṛhītaḥ niyamaḥ tataḥprabhṛti bhūbhṛtā

13. ca bhagīrathena bhūbhṛtā tataḥprabhṛti gaṅgām
divaḥ mahīm avatārayitum niyamaḥ gṛhītaḥ

13. And by Bhagīratha, from that time onwards, a vow (niyama) was undertaken by the king to bring the Gaṅgā down from heaven to the earth.

Words meanings summery:

• भगीरथेन (bhagīrathena) - by Bhagīratha

• च (ca) - and, also

• महीम् (mahīm) - earth

• अवतारयितुम् (avatārayitum) - to bring down, to cause to descend

• दिवः (divaḥ) - from heaven, from the sky

• गङ्गाम् (gaṅgām) - the Gaṅgā (river)

• गृहीतः (gṛhītaḥ) - taken, grasped, undertaken

• नियमः (niyamaḥ) - vow, rule, restraint, discipline

• ततःप्रभृति (tataḥprabhṛti) - from that time onwards, thenceforth

• भूभृता (bhūbhṛtā) - by the king (Bhagīratha) (by the king, by the mountain)

Words meanings and morphology

भगीरथेन (bhagīrathena) - by Bhagīratha

(proper noun)

Instrumental, masculine, singular of bhagīratha

bhagīratha - name of a king, son of Dilīpa, who brought the Gaṅgā to earth

च (ca) - and, also

(indeclinable)

महीम् (mahīm) - earth

(noun)

Accusative, feminine, singular of mahī

mahī - earth, ground

अवतारयितुम् (avatārayitum) - to bring down, to cause to descend

(indeclinable)

infinitive

root tṛ (to cross) with upasarga ava, causal form, then infinitive suffix -tum

Prefix: ava

Root: tṛ (class 1)

Note: infinitive expressing purpose

दिवः (divaḥ) - from heaven, from the sky

(noun)

Ablative, feminine, singular of div

div - heaven, sky, day

गङ्गाम् (gaṅgām) - the Gaṅgā (river)

(proper noun)

Accusative, feminine, singular of gaṅgā

gaṅgā - the river Ganges

गृहीतः (gṛhītaḥ) - taken, grasped, undertaken

(adjective)

Nominative, masculine, singular of gṛhīta

gṛhīta - taken, grasped, received, accepted

Past Passive Participle

root grah (to seize) + -ita

Root: grah (class 9)

Note: agrees with niyamaḥ

नियमः (niyamaḥ) - vow, rule, restraint, discipline

(noun)

Nominative, masculine, singular of niyama

niyama - vow, rule, restraint, discipline, religious observance

from ni-yam

Prefix: ni

Root: yam (class 1)

ततःप्रभृति (tataḥprabhṛti) - from that time onwards, thenceforth

(indeclinable)

Compound type : avyayībhāva (tatas+prabhṛti)

• tatas – from that, thence
  indeclinable
• prabhṛti – beginning from, onwards from
  indeclinable

भूभृता (bhūbhṛtā) - by the king (Bhagīratha) (by the king, by the mountain)

(noun)

Instrumental, masculine, singular of bhūbhṛt

bhūbhṛt - king, mountain

from bhū (earth) + bhṛ (to bear)

Compound type : tatpuruṣa (bhū+bhṛt)

• bhū – earth, ground
  noun (feminine)
• bhṛt – bearing, holding, maintaining
  adjective (masculine)
  agent noun/participial suffix
  from root bhṛ (to bear)
  Root: bhṛ (class 3)

Note: refers to Bhagīratha