महाभारतः mahābhārataḥ - book-3, chapter-13, verse-14

प्रभासं चाप्यथासाद्य तीर्थं पुण्यजनोचितम् ।
तथा कृष्ण महातेजा दिव्यं वर्षसहस्रकम् ।
आतिष्ठस्तप एकेन पादेन नियमे स्थितः ॥१४॥

14. prabhāsaṁ cāpyathāsādya tīrthaṁ puṇyajanocitam ,
tathā kṛṣṇa mahātejā divyaṁ varṣasahasrakam ,
ātiṣṭhastapa ekena pādena niyame sthitaḥ.

14. prabhāsam ca api atha āsādya tīrtham
puṇyajanocitam tathā kṛṣṇa mahātejā
divyam varṣasahasrakam ātiṣṭhaḥ
tapaḥ ekena pādena niyame sthitaḥ

14. And then, O Krishna, greatly resplendent one, having reached the holy place (tīrtha) of Prabhasa, which is suitable for pious people, you stood firm in a vow, performing penance (tapas) for a divine thousand years on one foot.

Words meanings summery:

• प्रभासम् (prabhāsam) - Prabhasa (a holy place)

• च (ca) - and, also

• अपि (api) - also, even, too

• अथ (atha) - then, next, now

• आसाद्य (āsādya) - having reached, having attained

• तीर्थम् (tīrtham) - holy place, sacred bathing place

• पुण्यजनोचितम् (puṇyajanocitam) - suitable for pious people

• तथा (tathā) - thus, similarly

• कृष्ण (kṛṣṇa) - O Krishna (vocative) (Krishna)

• महातेजा (mahātejā) - O greatly resplendent one (vocative, referring to Krishna) (great-lustrous, greatly resplendent)

• दिव्यम् (divyam) - divine, heavenly

• वर्षसहस्रकम् (varṣasahasrakam) - a thousand years

• आतिष्ठः (ātiṣṭhaḥ) - you stood, you performed, you observed

• तपः (tapaḥ) - penance, asceticism

• एकेन (ekena) - on one (foot) (by one)

• पादेन (pādena) - on one foot (by foot, with foot)

• नियमे (niyame) - in a rule, in a vow, in a discipline

• स्थितः (sthitaḥ) - firm in his observance/vow (as 'niyame sthitaḥ') (standing, situated, firm, steadfast)

Words meanings and morphology

प्रभासम् (prabhāsam) - Prabhasa (a holy place)

(proper noun)

Accusative, masculine, singular of prabhāsa

prabhāsa - a holy place, the place where Soma bathed, a pilgrimage site; luster, splendor

च (ca) - and, also

(indeclinable)

अपि (api) - also, even, too

(indeclinable)

अथ (atha) - then, next, now

(indeclinable)

आसाद्य (āsādya) - having reached, having attained

(indeclinable)

Gerund (Absolutive)

Indeclinable past participle (absolutive/gerund) formed from the root 'sad' with the prefix 'ā'

Prefix: ā

Root: sad (class 1)

Note: Absolutive (gerund) form.

तीर्थम् (tīrtham) - holy place, sacred bathing place

(noun)

Accusative, neuter, singular of tīrtha

tīrtha - a ford, a bathing place, a sacred spot, a holy place, a sanctuary, a sacred teacher

पुण्यजनोचितम् (puṇyajanocitam) - suitable for pious people

(adjective)

Accusative, neuter, singular of puṇyajanocita

puṇyajanocita - fit for pious people, suitable for righteous individuals

Compound type : tatpuruṣa (puṇyajana+ucita)

• puṇyajana – pious person, righteous person, a good individual
  noun (masculine)
• ucita – proper, fit, suitable, appropriate
  adjective (neuter)
  Past Passive Participle
  Past Passive Participle from the root 'uc'
  Root: uc (class 4)

Note: Adjective modifying 'tīrtham'.

तथा (tathā) - thus, similarly

(indeclinable)

कृष्ण (kṛṣṇa) - O Krishna (vocative) (Krishna)

(proper noun)

Vocative, masculine, singular of kṛṣṇa

kṛṣṇa - dark, black; Krishna (name of a deity, avatar of Vishnu)

महातेजा (mahātejā) - O greatly resplendent one (vocative, referring to Krishna) (great-lustrous, greatly resplendent)

(adjective)

Vocative, masculine, singular of mahātejas

mahātejas - great energy, great luster, great splendor, highly powerful

Compound type : bahuvrīhi (mahā+tejas)

• mahā – great, mighty, large, powerful
  adjective
• tejas – splendor, luster, energy, power, fiery energy, brilliance
  noun (neuter)

Note: Declined from the neuter stem 'mahātejas' to agree with 'kṛṣṇa'.

दिव्यम् (divyam) - divine, heavenly

(adjective)

Accusative, neuter, singular of divya

divya - divine, heavenly, celestial, supernatural, wonderful

Note: Adjective modifying 'varṣasahasrakam'.

वर्षसहस्रकम् (varṣasahasrakam) - a thousand years

(noun)

Accusative, neuter, singular of varṣasahasraka

varṣasahasraka - a thousand years

Compound type : tatpuruṣa (varṣa+sahasraka)

• varṣa – year, rain, rainy season
  noun (neuter)
• sahasraka – a thousand, consisting of a thousand
  noun (neuter)

Note: Used adverbially to denote duration.

आतिष्ठः (ātiṣṭhaḥ) - you stood, you performed, you observed

(verb)

2nd person , singular, active, past imperfect (laṅ) of sthā

Imperfect active 2nd singular

Imperfect (laṅ), Parasmaipada, 2nd person singular of the root 'sthā' with the prefix 'ā'

Prefix: ā

Root: sthā (class 1)

तपः (tapaḥ) - penance, asceticism

(noun)

Accusative, neuter, singular of tapas

tapas - heat, penance, asceticism, religious austerity, spiritual fervor

Root: tap (class 1)

Note: Direct object of the verb 'ātiṣṭhaḥ'.

एकेन (ekena) - on one (foot) (by one)

(numeral)

Note: Adjective modifying 'pādena'.

पादेन (pādena) - on one foot (by foot, with foot)

(noun)

Instrumental, masculine, singular of pāda

pāda - foot, leg, quarter (of a verse), ray (of light), column

नियमे (niyame) - in a rule, in a vow, in a discipline

(noun)

Locative, masculine, singular of niyama

niyama - a rule, a restriction, an observance, a vow, a discipline, self-restraint

Root: yam (class 1)

स्थितः (sthitaḥ) - firm in his observance/vow (as 'niyame sthitaḥ') (standing, situated, firm, steadfast)

(adjective)

Nominative, masculine, singular of sthita

sthita - stood, stayed, fixed, abiding, firm, situated

Past Passive Participle

Past Passive Participle from the root 'sthā' (to stand)

Root: sthā (class 1)

Note: P.P.P. agreeing with the implicit subject (Krishna).