महाभारतः mahābhārataḥ - book-13, chapter-69, verse-2

निविशन्त्यां पुरा पार्थ द्वारवत्यामिति श्रुतिः ।
अदृश्यत महाकूपस्तृणवीरुत्समावृतः ॥२॥

2. niviśantyāṁ purā pārtha dvāravatyāmiti śrutiḥ ,
adṛśyata mahākūpastṛṇavīrutsamāvṛtaḥ.

2. niviśantyām purā pārtha dvāravatyām iti
śrutiḥ adṛśyata mahākūpaḥ tṛṇavīrutsamāvṛtaḥ

2. pārtha purā dvāravatyām niviśantyām iti
śrutiḥ tṛṇavīrutsamāvṛtaḥ mahākūpaḥ adṛśyata

2. O Pārtha, there is a tradition (śruti) that formerly, as Dvaraka was being established, a large well was observed, completely overgrown with grass and creepers.

Words meanings summery:

• निविशन्त्याम् (niviśantyām) - as Dvaraka was being established/settled (in settling, while entering, while being settled)

• पुरा (purā) - formerly, in ancient times (formerly, anciently, in the beginning)

• पार्थ (pārtha) - O son of Pṛthā (Arjuna or Yudhiṣṭhira) (O Pārtha, O son of Pṛthā)

• द्वारवत्याम् (dvāravatyām) - in the city of Dvaraka (in Dvaraka)

• इति (iti) - thus goes the tradition (thus, in this manner (marks conclusion or direct quotation))

• श्रुतिः (śrutiḥ) - tradition, narrative (tradition, Vedic text, what is heard, revelation)

• अदृश्यत (adṛśyata) - was observed (was seen, appeared)

• महाकूपः (mahākūpaḥ) - a large well (a great well, a large well)

• तृणवीरुत्समावृतः (tṛṇavīrutsamāvṛtaḥ) - completely overgrown with grass and creepers (covered with grass and creepers)

Words meanings and morphology

निविशन्त्याम् (niviśantyām) - as Dvaraka was being established/settled (in settling, while entering, while being settled)

(adjective)

Locative, feminine, singular of niviśat

niviśat - entering, settling, occupying

Present Active Participle

From ni + root viś (to enter, settle)

Prefix: ni

Root: viś (class 6)

Note: Temporal modifier, agreeing with Dvāravatyām.

पुरा (purā) - formerly, in ancient times (formerly, anciently, in the beginning)

(indeclinable)

Adverb of time

पार्थ (pārtha) - O son of Pṛthā (Arjuna or Yudhiṣṭhira) (O Pārtha, O son of Pṛthā)

(proper noun)

Vocative, masculine, singular of pārtha

pārtha - son of Pṛthā (Kuntī), refers to Yudhiṣṭhira, Bhīma, Arjuna

Derived from Pṛthā (Kuntī) by aṇ-pratyaya (patronymic)

Note: Addressee

द्वारवत्याम् (dvāravatyām) - in the city of Dvaraka (in Dvaraka)

(proper noun)

Locative, feminine, singular of dvāravatī

dvāravatī - Dvaraka (name of a city founded by Krishna)

Feminine noun

इति (iti) - thus goes the tradition (thus, in this manner (marks conclusion or direct quotation))

(indeclinable)

Particle

Note: Indicates `śrutiḥ` refers to the preceding statement.

श्रुतिः (śrutiḥ) - tradition, narrative (tradition, Vedic text, what is heard, revelation)

(noun)

Nominative, feminine, singular of śruti

śruti - hearing, listening, tradition, revelation, Vedic text

From root śru (to hear)

Root: śru (class 5)

Note: Subject of implied verb 'is'

अदृश्यत (adṛśyata) - was observed (was seen, appeared)

(verb)

3rd person , singular, passive, past imperfect (laṅ) of dṛś

Denominative passive form of root dṛś

Root: dṛś (class 1)

महाकूपः (mahākūpaḥ) - a large well (a great well, a large well)

(noun)

Nominative, masculine, singular of mahākūpa

mahākūpa - great well, large well

Compound of 'mahā' (great) and 'kūpa' (well)

Compound type : karmadhāraya (mahā+kūpa)

• mahā – great, large, mighty (prefix form of mahat)
  adjective
• kūpa – well, pit, hole
  noun (masculine)
  Root: kup (class 4)

Note: Subject of `adṛśyata`

तृणवीरुत्समावृतः (tṛṇavīrutsamāvṛtaḥ) - completely overgrown with grass and creepers (covered with grass and creepers)

(adjective)

Nominative, masculine, singular of tṛṇavīrutsamāvṛta

tṛṇavīrutsamāvṛta - covered/overgrown with grass and creepers

Compound of 'tṛṇa' (grass), 'vīrudh' (creeper), and 'samāvṛta' (covered, surrounded)

Compound type : bahuvrīhi (tṛṇa+vīrudh+samāvṛta)

• tṛṇa – grass, straw
  noun (neuter)
  Root: tṛh (class 1)
• vīrudh – creeper, plant, herb
  noun (feminine)
  Prefix: vi
  Root: ruh (class 1)
• samāvṛta – covered, surrounded, enveloped
  adjective (masculine)
  Past Passive Participle
  From sam + ā + root vṛ (to cover, surround)
  Prefixes: sam+ā
  Root: vṛ (class 5)

Note: Qualifies `mahākūpaḥ`