महाभारतः mahābhārataḥ - book-1, chapter-43, verse-19

उत्तिष्ठ त्वं महाभाग सूर्योऽस्तमुपगच्छति ।
संध्यामुपास्स्व भगवन्नपः स्पृष्ट्वा यतव्रतः ॥१९॥

19. uttiṣṭha tvaṁ mahābhāga sūryo'stamupagacchati ,
saṁdhyāmupāssva bhagavannapaḥ spṛṣṭvā yatavrataḥ.

19. uttiṣṭha tvam mahābhāga sūryaḥ astam upagacchati
saṃdhyām upāsva bhagavan apaḥ spṛṣṭvā yatavrataḥ

19. Rise, O greatly fortunate one! The sun is setting. O venerable one, having touched water and with your vows disciplined, perform your twilight prayer.

Words meanings summery:

• उत्तिष्ठ (uttiṣṭha) - rise (rise, stand up)

• त्वम् (tvam) - you (you (nominative singular))

• महाभाग (mahābhāga) - O greatly fortunate one (O greatly fortunate one, O highly esteemed one)

• सूर्यः (sūryaḥ) - the sun (sun, the sun god)

• अस्तम् (astam) - setting (of the sun) (home, setting (of sun), disappearance)

• उपगच्छति (upagacchati) - is setting (approaches, goes to, obtains, sets (for sun))

• संध्याम् (saṁdhyām) - twilight prayer (twilight, twilight prayer)

• उपास्व (upāsva) - perform (worship, attend to, perform)

• भगवन् (bhagavan) - O venerable one (O venerable one, O glorious one, O divine one)

• अपः (apaḥ) - water (waters)

• स्पृष्ट्वा (spṛṣṭvā) - having touched (having touched, having come into contact with)

• यतव्रतः (yatavrataḥ) - with your vows disciplined (one whose vows are restrained, disciplined in vows, having disciplined vows)

Words meanings and morphology

उत्तिष्ठ (uttiṣṭha) - rise (rise, stand up)

(verb)

2nd person , singular, active, imperative (loṭ) of utthā

From root sthā (to stand) with prefix ut.

Prefix: ut

Root: sthā (class 1)

त्वम् (tvam) - you (you (nominative singular))

(pronoun)

Nominative, singular of yuṣmad

yuṣmad - you (singular, dual, plural)

2nd person pronoun.

महाभाग (mahābhāga) - O greatly fortunate one (O greatly fortunate one, O highly esteemed one)

(noun)

Vocative, masculine, singular of mahābhāga

mahābhāga - greatly fortunate, highly esteemed, noble, illustrious

Bahuvrīhi compound: mahā (great) + bhāga (fortune, share).

Compound type : bahuvrīhi (mahā+bhāga)

• mahā – great, large, extensive, mighty
  adjective (masculine)
  From mahat (great).
• bhāga – share, portion, fortune, lot, destiny
  noun (masculine)
  From root bhaj (to divide, share).
  Root: bhaj (class 1)

Note: Addressed to Jaratkāru (the sage).

सूर्यः (sūryaḥ) - the sun (sun, the sun god)

(noun)

Nominative, masculine, singular of sūrya

sūrya - sun, the god Sūrya

From root svar (to shine).

Root: svar

अस्तम् (astam) - setting (of the sun) (home, setting (of sun), disappearance)

(noun)

Accusative, masculine, singular of asta

asta - home, residence, setting (of a heavenly body), disappearance

From root as (to throw, cast).

Root: as (class 4)

Note: Used adverbially or as object of motion with upagacchati.

उपगच्छति (upagacchati) - is setting (approaches, goes to, obtains, sets (for sun))

(verb)

3rd person , singular, active, present (laṭ) of upagam

From root gam (to go) with prefix upa.

Prefix: upa

Root: gam (class 1)

संध्याम् (saṁdhyām) - twilight prayer (twilight, twilight prayer)

(noun)

Accusative, feminine, singular of saṃdhyā

saṁdhyā - twilight, juncture of day and night, morning and evening prayer

From sam + dhā + ya.

Root: dhā

Note: Object of upāsva.

उपास्व (upāsva) - perform (worship, attend to, perform)

(verb)

2nd person , singular, middle, imperative (loṭ) of upās

From root ās (to sit) with prefix upa.

Prefix: upa

Root: ās (class 2)

भगवन् (bhagavan) - O venerable one (O venerable one, O glorious one, O divine one)

(noun)

Vocative, masculine, singular of bhagavat

bhagavat - venerable, glorious, divine, fortunate, prosperous; often used as an epithet for gods or revered persons

present active participle

From root bhaj (to distribute, possess) with suffix vat.

Root: bhaj (class 1)

Note: Addressed to Jaratkāru (the sage).

अपः (apaḥ) - water (waters)

(noun)

Accusative, feminine, plural of ap

ap - water

Always used in plural in Sanskrit.

Note: Object of spṛṣṭvā.

स्पृष्ट्वा (spṛṣṭvā) - having touched (having touched, having come into contact with)

(indeclinable participle)

यतव्रतः (yatavrataḥ) - with your vows disciplined (one whose vows are restrained, disciplined in vows, having disciplined vows)

(adjective)

Nominative, masculine, singular of yatavrata

yatavrata - one whose vows are restrained or disciplined, observant of vows

Bahuvrīhi compound: yata (restrained, controlled) + vrata (vow, religious observance).

Compound type : bahuvrīhi (yata+vrata)

• yata – restrained, controlled, disciplined, guided
  adjective (masculine)
  past passive participle
  From root yam (to restrain, control).
  Root: yam (class 1)
• vrata – vow, religious observance, sacred duty, practice
  noun (neuter)
  From root vṛ (to choose, vow).
  Root: vṛ (class 9)

Note: Qualifies tvam (implied).