महाभारतः mahābhārataḥ - book-3, chapter-299, verse-18

विष्णुना वसता चापि गृहे दशरथस्य वै ।
दशग्रीवो हतश्छन्नं संयुगे भीमकर्मणा ॥१८॥

18. viṣṇunā vasatā cāpi gṛhe daśarathasya vai ,
daśagrīvo hataśchannaṁ saṁyuge bhīmakarmaṇā.

18. viṣṇunā vasatā ca api gṛhe daśarathasya vai
daśagrīvaḥ hataḥ channam saṃyuge bhīmakarmaṇā

18. Indeed, Daśagrīva was secretly killed in battle by Viṣṇu, who performed formidable deeds while dwelling in Daśaratha's house.

Words meanings summery:

• विष्णुना (viṣṇunā) - by Viṣṇu

• वसता (vasatā) - by Viṣṇu, who was dwelling (by the one dwelling, by the resident)

• च (ca) - and, also

• अपि (api) - also, even, indeed

• गृहे (gṛhe) - in the house, in the home

• दशरथस्य (daśarathasya) - of Daśaratha

• वै (vai) - indeed, certainly, truly

• दशग्रीवः (daśagrīvaḥ) - Daśagrīva (Rāvaṇa)

• हतः (hataḥ) - killed, slain, destroyed

• छन्नम् (channam) - secretly, hiddenly, covered

• संयुगे (saṁyuge) - in battle, in combat, in encounter

• भीमकर्मणा (bhīmakarmaṇā) - by Viṣṇu, who performed formidable deeds (by the one performing terrible/formidable deeds)

Words meanings and morphology

विष्णुना (viṣṇunā) - by Viṣṇu

(proper noun)

Instrumental, masculine, singular of viṣṇu

viṣṇu - Viṣṇu (a principal deity in Hinduism)

वसता (vasatā) - by Viṣṇu, who was dwelling (by the one dwelling, by the resident)

(adjective)

Instrumental, masculine, singular of vasat

vasat - dwelling, residing

Present Active Participle

Derived from root vas (class 1, 'to dwell')

Root: vas (class 1)

च (ca) - and, also

(indeclinable)

अपि (api) - also, even, indeed

(indeclinable)

गृहे (gṛhe) - in the house, in the home

(noun)

Locative, neuter, singular of gṛha

gṛha - house, home, dwelling

दशरथस्य (daśarathasya) - of Daśaratha

(proper noun)

Genitive, masculine, singular of daśaratha

daśaratha - Daśaratha (a king of Ayodhya, father of Rama)

वै (vai) - indeed, certainly, truly

(indeclinable)

दशग्रीवः (daśagrīvaḥ) - Daśagrīva (Rāvaṇa)

(proper noun)

Nominative, masculine, singular of daśagrīva

daśagrīva - "ten-necked", an epithet for Rāvaṇa

Compound type : bahuvrīhi (daśa+grīva)

• daśa – ten
  numeral
• grīva – neck, head
  noun (masculine)

हतः (hataḥ) - killed, slain, destroyed

(adjective)

Nominative, masculine, singular of hata

hata - killed, slain, struck, injured

Past Passive Participle

Derived from root han (class 2, 'to strike, kill')

Root: han (class 2)

छन्नम् (channam) - secretly, hiddenly, covered

(indeclinable)

Past Passive Participle

Derived from root chad (class 1, 'to cover'), used adverbially.

Root: chad (class 1)

Note: Used adverbially.

संयुगे (saṁyuge) - in battle, in combat, in encounter

(noun)

Locative, masculine, singular of saṃyuga

saṁyuga - battle, combat, encounter, conflict

भीमकर्मणा (bhīmakarmaṇā) - by Viṣṇu, who performed formidable deeds (by the one performing terrible/formidable deeds)

(adjective)

Instrumental, masculine, singular of bhīmakarman

bhīmakarman - having formidable/terrible deeds, one whose actions are formidable

Compound type : bahuvrīhi (bhīma+karman)

• bhīma – terrible, formidable, dreadful
  adjective (masculine)
• karman – action, deed, work (karma)
  noun (neuter)
  Root: kṛ (class 8)

Note: Refers to Viṣṇu/Rāma.