महाभारतः mahābhārataḥ - book-1, chapter-2, verse-131

यत्र प्रविश्य नगरं छद्मभिर्न्यवसन्त ते ।
दुरात्मनो वधो यत्र कीचकस्य वृकोदरात् ॥१३१॥

131. yatra praviśya nagaraṁ chadmabhirnyavasanta te ,
durātmano vadho yatra kīcakasya vṛkodarāt.

131. yatra praviśya nagaram chadmbhiḥ nyavasanta te
durātmanaḥ vadhaḥ yatra kīcakasya vṛkodarāt

131. Where they entered the city and resided in disguise, and where the wicked Kīcaka was slain by Vṛkodara.

Words meanings summery:

• यत्र (yatra) - where, in which place

• प्रविश्य (praviśya) - having entered

• नगरम् (nagaram) - city

• छद्म्भिः (chadmbhiḥ) - by disguises, with pretenses

• न्यवसन्त (nyavasanta) - they resided

• ते (te) - they

• दुरात्मनः (durātmanaḥ) - of the evil-minded one, of the wicked soul

• वधः (vadhaḥ) - slaying, killing

• यत्र (yatra) - where, in which place

• कीचकस्य (kīcakasya) - of Kīcaka

• वृकोदरात् (vṛkodarāt) - by Vṛkodara (Bhīma) (from Vṛkodara)

Words meanings and morphology

यत्र (yatra) - where, in which place

(indeclinable)

प्रविश्य (praviśya) - having entered

(indeclinable)

absolutive

Suffix -ya

Prefix: pra

Root: viś (class 6)

नगरम् (nagaram) - city

(noun)

Accusative, neuter, singular of nagara

nagara - city, town

छद्म्भिः (chadmbhiḥ) - by disguises, with pretenses

(noun)

Instrumental, neuter, plural of chadman

chadman - disguise, cover, pretense, fraud

न्यवसन्त (nyavasanta) - they resided

(verb)

3rd person , plural, active, past imperfect (laṅ) of ni-vas

Prefix: ni

Root: vas (class 1)

ते (te) - they

(pronoun)

Nominative, masculine, plural of tad

tad - that, he, she, it

दुरात्मनः (durātmanaḥ) - of the evil-minded one, of the wicked soul

(adjective)

Genitive, masculine, singular of durātman

durātman - evil-minded, wicked, malicious

Compound type : bahuvrīhi (dur+ātman)

• dur – bad, evil, difficult, ill-
  prefix
• ātman – self, soul, spirit, essence
  noun (masculine)

Note: Used here substantively.

वधः (vadhaḥ) - slaying, killing

(noun)

Nominative, masculine, singular of vadha

vadha - killing, slaying, striking, destruction

यत्र (yatra) - where, in which place

(indeclinable)

कीचकस्य (kīcakasya) - of Kīcaka

(noun)

Genitive, masculine, singular of kīcaka

kīcaka - Kīcaka (proper name, brother-in-law of King Virāṭa)

वृकोदरात् (vṛkodarāt) - by Vṛkodara (Bhīma) (from Vṛkodara)

(noun)

Ablative, masculine, singular of vṛkodara

vṛkodara - wolf-bellied (epithet of Bhīma), a kind of serpent

Compound type : bahuvrīhi (vṛka+udara)

• vṛka – wolf
  noun (masculine)
• udara – belly, abdomen
  noun (neuter)

Note: Ablative can denote the agent of an action, especially with verbs of fear, protection, or here, a source/agent in a passive construction context.