महाभारतः mahābhārataḥ - book-3, chapter-195, verse-8

अन्तर्भूमिगतस्तत्र वालुकान्तर्हितस्तदा ।
मधुकैटभयोः पुत्रो धुन्धुर्भीमपराक्रमः ॥८॥

8. antarbhūmigatastatra vālukāntarhitastadā ,
madhukaiṭabhayoḥ putro dhundhurbhīmaparākramaḥ.

8. antarbhūmigataḥ tatra vālukāntarhitaḥ tadā
madhukaiṭabhayoḥ putraḥ dhundhuḥ bhīmaparākramaḥ

8. At that time, Dhundhu, the son of Madhu and Kaiṭabha, possessing terrible valor, was there, gone beneath the earth and hidden within the sand.

Words meanings summery:

• अन्तर्भूमिगतः (antarbhūmigataḥ) - gone within the earth, subterranean, buried

• तत्र (tatra) - there, in that place

• वालुकान्तर्हितः (vālukāntarhitaḥ) - hidden within the sand, covered by sand

• तदा (tadā) - then, at that time, at that moment

• मधुकैटभयोः (madhukaiṭabhayoḥ) - of Madhu and Kaiṭabha

• पुत्रः (putraḥ) - son

• धुन्धुः (dhundhuḥ) - Dhundhu (name of an Asura)

• भीमपराक्रमः (bhīmaparākramaḥ) - of terrible valor, of dreadful might

Words meanings and morphology

अन्तर्भूमिगतः (antarbhūmigataḥ) - gone within the earth, subterranean, buried

(adjective)

Nominative, masculine, singular of antarbhūmigata

antarbhūmigata - gone within the earth, subterranean

Compound type : Tatpuruṣa (antar+bhūmi+gata)

• antar – within, inside, between
  indeclinable
• bhūmi – earth, ground, land
  noun (feminine)
• gata – gone, arrived at, reached
  adjective (masculine)
  Past Passive Participle
  Derived from root 'gam' (class 1, 'to go').
  Root: gam (class 1)

तत्र (tatra) - there, in that place

(indeclinable)

वालुकान्तर्हितः (vālukāntarhitaḥ) - hidden within the sand, covered by sand

(adjective)

Nominative, masculine, singular of vālukāntarhita

vālukāntarhita - hidden in sand

Compound type : Tatpuruṣa (vālukā+antar+hita)

• vālukā – sand, gravel
  noun (feminine)
• antar – within, inside
  indeclinable
• hita – placed, put, hidden, beneficial
  adjective (masculine)
  Past Passive Participle
  Derived from root 'dhā' (class 3, 'to place, put') with preverb 'ni-' (implicit in meaning 'hidden').
  Root: dhā (class 3)

तदा (tadā) - then, at that time, at that moment

(indeclinable)

मधुकैटभयोः (madhukaiṭabhayoḥ) - of Madhu and Kaiṭabha

(noun)

Genitive, masculine, dual of madhukaiṭabha

madhukaiṭabha - Madhu and Kaiṭabha

Compound type : Dvandva (madhu+kaiṭabha)

• madhu – Madhu (name of a demon)
  proper noun (masculine)
• kaiṭabha – Kaiṭabha (name of a demon)
  proper noun (masculine)

पुत्रः (putraḥ) - son

(noun)

Nominative, masculine, singular of putra

putra - son, child

धुन्धुः (dhundhuḥ) - Dhundhu (name of an Asura)

(proper noun)

Nominative, masculine, singular of dhundhu

dhundhu - Dhundhu (name of a demon)

भीमपराक्रमः (bhīmaparākramaḥ) - of terrible valor, of dreadful might

(adjective)

Nominative, masculine, singular of bhīmaparākrama

bhīmaparākrama - of dreadful might, having terrible prowess

Compound type : Bahuvrīhi (bhīma+parākrama)

• bhīma – terrible, dreadful, formidable
  adjective (masculine)
• parākrama – might, prowess, courage, exertion
  noun (masculine)