योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-21, verse-17

प्रतपन्ति यदादित्याः शकलीकृतभूधराः ।
वारुणीं धारणां बद्ध्वा तदा तिष्ठामि धीरधीः ॥ १७ ॥

pratapanti yadādityāḥ śakalīkṛtabhūdharāḥ ,
vāruṇīṃ dhāraṇāṃ baddhvā tadā tiṣṭhāmi dhīradhīḥ 17

17. pratapanti yadā ādityāḥ śakalīkṛtabhūdharāḥ
vāruṇīm dhāraṇām baddhvā tadā tiṣṭhāmi dhīradhīḥ

17. yadā ādityāḥ śakalīkṛtabhūdharāḥ pratapanti tadā
vāruṇīm dhāraṇām baddhvā dhīradhīḥ tiṣṭhāmi

17. When the suns scorch intensely, turning mountains into fragments, then I remain with a steadfast mind, having established myself in the aqueous meditation (vāruṇī dhāraṇā).

Words meanings summery:

• प्रतपन्ति (pratapanti) - they intensely burn, they heat strongly

• यदा (yadā) - when

• आदित्याः (ādityāḥ) - suns, sons of Aditi

• शकलीकृतभूधराः (śakalīkṛtabhūdharāḥ) - mountains that have been turned into pieces, mountains shattered

• वारुणीम् (vāruṇīm) - aqueous, meditative absorption related to the water element (aqueous, pertaining to Varuṇa)

• धारणाम् (dhāraṇām) - mental retention, concentration, meditative absorption

• बद्ध्वा (baddhvā) - having bound, having fixed, having established

• तदा (tadā) - then, at that time

• तिष्ठामि (tiṣṭhāmi) - I stand, I remain, I dwell

• धीरधीः (dhīradhīḥ) - firm-minded, steadfast intellect

Words meanings and morphology

प्रतपन्ति (pratapanti) - they intensely burn, they heat strongly

(verb)

3rd person , plural, active, present indicative (lat) of pra-tap

Present Active Indic

3rd Person Plural

Prefix: pra

Root: tap (class 1)

यदा (yadā) - when

(indeclinable)

आदित्याः (ādityāḥ) - suns, sons of Aditi

(noun)

Nominative, masculine, plural of āditya

āditya - sun, son of Aditi

शकलीकृतभूधराः (śakalīkṛtabhūdharāḥ) - mountains that have been turned into pieces, mountains shattered

(adjective)

Nominative, masculine, plural of śakalīkṛtabhūdhara

śakalīkṛtabhūdhara - mountains shattered into pieces

Compound type : Bahuvrīhi (śakalīkṛta+bhūdhara)

• śakalīkṛta – made into pieces, shattered
  adjective (neuter)
  Past Passive Participle
  from śakalī-kṛ (to make into pieces)
  Root: kṛ (class 8)
• bhūdhara – mountain (lit. earth-bearer)
  noun (masculine)

वारुणीम् (vāruṇīm) - aqueous, meditative absorption related to the water element (aqueous, pertaining to Varuṇa)

(adjective)

Accusative, feminine, singular of vāruṇī

vāruṇī - pertaining to Varuṇa, watery

धारणाम् (dhāraṇām) - mental retention, concentration, meditative absorption

(noun)

Accusative, feminine, singular of dhāraṇā

dhāraṇā - retention, concentration, meditation

Root: dhṛ (class 1)

बद्ध्वा (baddhvā) - having bound, having fixed, having established

(indeclinable)

Absolutive (Gerund)

Root: bandh (class 1)

तदा (tadā) - then, at that time

(indeclinable)

तिष्ठामि (tiṣṭhāmi) - I stand, I remain, I dwell

(verb)

1st person , singular, active, present indicative (lat) of sthā

Present Active Indic

1st Person Singular

Root: sthā (class 1)

धीरधीः (dhīradhīḥ) - firm-minded, steadfast intellect

(adjective)

Nominative, masculine, singular of dhīradhī

dhīradhī - one whose intellect is firm, steadfast mind

Compound type : Bahuvrīhi (dhīra+dhī)

• dhīra – firm, steady, courageous
  adjective (masculine)
• dhī – intellect, thought, mind
  noun (feminine)