महाभारतः mahābhārataḥ - book-1, chapter-166, verse-12

तयोर्विवदतोरेवं समीपमुपचक्रमे ।
ऋषिरुग्रतपाः पार्थ विश्वामित्रः प्रतापवान् ॥१२॥

12. tayorvivadatorevaṁ samīpamupacakrame ,
ṛṣirugratapāḥ pārtha viśvāmitraḥ pratāpavān.

12. tayoḥ vivadator evam samīpam upacakrame ṛṣiḥ
ugratapāḥ pārtha viśvāmitraḥ pratāpavān

12. As those two were thus disputing, the glorious sage Viśvāmitra, possessing fierce austerities (tapas), O Pārtha, approached them.

Words meanings summery:

• तयोः (tayoḥ) - between Viśvāmitra and Vasiṣṭha (of those two, between those two)

• विवदतोः (vivadatoḥ) - of Viśvāmitra and Vasiṣṭha disputing (of the two disputing, as they two were disputing)

• एवम् (evam) - thus, in this manner, so

• समीपम् (samīpam) - near, vicinity, proximity

• उपचक्रमे (upacakrame) - he approached, he began, he undertook

• ऋषिः (ṛṣiḥ) - the sage Viśvāmitra (sage, seer)

• उग्रतपाः (ugratapāḥ) - of fierce austerities (tapas), possessing severe penance

• पार्थ (pārtha) - O Arjuna (O son of Pṛthā)

• विश्वामित्रः (viśvāmitraḥ) - Viśvāmitra (a proper name)

• प्रतापवान् (pratāpavān) - glorious, majestic, powerful

Words meanings and morphology

तयोः (tayoḥ) - between Viśvāmitra and Vasiṣṭha (of those two, between those two)

(pronoun)

Genitive, masculine, dual of tad

tad - that, he, she, it

विवदतोः (vivadatoḥ) - of Viśvāmitra and Vasiṣṭha disputing (of the two disputing, as they two were disputing)

(adjective)

Genitive, masculine, dual of vivadat

vivadat - disputing, contending, arguing

Present Active Participle

From vi-vad (to dispute, contend) + śatṛ (PAP suffix)

Prefix: vi

Root: vad (class 1)

एवम् (evam) - thus, in this manner, so

(indeclinable)

समीपम् (samīpam) - near, vicinity, proximity

(noun)

Accusative, neuter, singular of samīpa

samīpa - near, proximity, vicinity

उपचक्रमे (upacakrame) - he approached, he began, he undertook

(verb)

3rd person , singular, middle, perfect (lit) of upakram

Prefix: upa

Root: kram (class 1)

ऋषिः (ṛṣiḥ) - the sage Viśvāmitra (sage, seer)

(noun)

Nominative, masculine, singular of ṛṣi

ṛṣi - sage, seer, inspired poet

उग्रतपाः (ugratapāḥ) - of fierce austerities (tapas), possessing severe penance

(adjective)

Nominative, masculine, singular of ugratapas

ugratapas - one whose austerities are fierce, possessing severe penance

Compound type : bahuvrīhi (ugra+tapas)

• ugra – fierce, severe, terrible, mighty
  adjective (masculine)
• tapas – austerity, penance, spiritual fervor
  noun (neuter)

पार्थ (pārtha) - O Arjuna (O son of Pṛthā)

(proper noun)

Vocative, masculine, singular of pārtha

pārtha - son of Pṛthā (Kuntī); Arjuna, Yudhiṣṭhira, Bhīmasena

Patronymic from Pṛthā

विश्वामित्रः (viśvāmitraḥ) - Viśvāmitra (a proper name)

(proper noun)

Nominative, masculine, singular of viśvāmitra

viśvāmitra - Viśvāmitra (a proper name, sage)

प्रतापवान् (pratāpavān) - glorious, majestic, powerful

(adjective)

Nominative, masculine, singular of pratāpavat

pratāpavat - possessing majesty, glorious, powerful, splendid

Possessive suffix vatup (from pratāpa)