महाभारतः mahābhārataḥ - book-8, chapter-27, verse-38

बिलस्थं कृष्णसर्पं त्वं बाल्यात्काष्ठेन विध्यसि ।
महाविषं पूर्णकोशं यत्पार्थं योद्धुमिच्छसि ॥३८॥

38. bilasthaṁ kṛṣṇasarpaṁ tvaṁ bālyātkāṣṭhena vidhyasi ,
mahāviṣaṁ pūrṇakośaṁ yatpārthaṁ yoddhumicchasi.

38. bilastham kṛṣṇasarpam tvam bālyāt kāṣṭhena vidhyasi
mahāviṣam pūrṇakośam yat pārtham yoddhum icchasi

38. tvam bālyāt kāṣṭhena bilastham mahāviṣam pūrṇakośam
kṛṣṇasarpam vidhyasi yat (iva) pārtham yoddhum icchasi

38. Out of foolishness (bālyāt), you (tvam) strike with a stick (kāṣṭhena) a black serpent (kṛṣṇasarpam) that resides in a hole (bilastham), a serpent that is exceedingly venomous (mahāviṣam) and full of poison (pūrṇakośam). This is why you wish to fight Pārtha (Arjuna).

Words meanings summery:

• बिलस्थम् (bilastham) - residing in a hole/den

• कृष्णसर्पम् (kṛṣṇasarpam) - black serpent, cobra

• त्वम् (tvam) - you

• बाल्यात् (bālyāt) - out of foolishness (from childishness, out of foolishness)

• काष्ठेन (kāṣṭhena) - with a stick, by wood

• विध्यसि (vidhyasi) - you strike, you pierce, you hit

• महाविषम् (mahāviṣam) - exceedingly venomous (greatly venomous, having great poison)

• पूर्णकोशम् (pūrṇakośam) - full of poison (referring to the snake's venom sac) (full of a sheath/bag (of venom), full of treasure)

• यत् (yat) - because (implying 'it is because you do this foolish act, that you wish to fight Arjuna') (which, what, that, because, since)

• पार्थम् (pārtham) - Arjuna (Pārtha (Arjuna))

• योद्धुम् (yoddhum) - to fight, for fighting

• इच्छसि (icchasi) - you wish, you desire

Words meanings and morphology

बिलस्थम् (bilastham) - residing in a hole/den

(adjective)

Accusative, masculine, singular of bilastha

bilastha - standing/residing in a hole or den

Compound formed with 'bila' (hole) and 'stha' (standing, located) from root 'sthā'.

Compound type : upapada tatpuruṣa (bila+stha)

• bila – hole, cavern, den
  noun (neuter)
• stha – standing, residing, located
  adjective
  kṛt affix
  Derived from the root 'sthā-' (to stand) with a kṛt affix.
  Root: sthā (class 1)

कृष्णसर्पम् (kṛṣṇasarpam) - black serpent, cobra

(noun)

Accusative, masculine, singular of kṛṣṇasarpa

kṛṣṇasarpa - black serpent, cobra

Compound type : karmadhāraya (kṛṣṇa+sarpa)

• kṛṣṇa – black, dark
  adjective
• sarpa – snake, serpent
  noun (masculine)

त्वम् (tvam) - you

(pronoun)

Nominative, singular of tvad

tvad - you (second person pronoun)

बाल्यात् (bālyāt) - out of foolishness (from childishness, out of foolishness)

(noun)

Ablative, neuter, singular of bālya

bālya - childishness, folly, infancy, ignorance

काष्ठेन (kāṣṭhena) - with a stick, by wood

(noun)

Instrumental, neuter, singular of kāṣṭha

kāṣṭha - wood, stick, log, piece of wood

विध्यसि (vidhyasi) - you strike, you pierce, you hit

(verb)

2nd person , singular, active, present (laṭ) of vyadh

Root: vyadh (class 4)

महाविषम् (mahāviṣam) - exceedingly venomous (greatly venomous, having great poison)

(adjective)

Accusative, masculine, singular of mahāviṣa

mahāviṣa - having great poison, greatly venomous, deadly poison

Compound type : bahuvrīhi (mahā+viṣa)

• mahā – great, large, extensive
  adjective
• viṣa – poison, venom
  noun (neuter)

पूर्णकोशम् (pūrṇakośam) - full of poison (referring to the snake's venom sac) (full of a sheath/bag (of venom), full of treasure)

(adjective)

Accusative, masculine, singular of pūrṇakośa

pūrṇakośa - having a full sheath/bag/treasury; full of venom (for a snake)

Compound type : bahuvrīhi (pūrṇa+kośa)

• pūrṇa – full, complete, filled
  adjective
  Past Passive Participle
  Derived from the root 'pṛ-' (to fill) with the kta suffix.
  Root: pṛ (class 9)
• kośa – sheath, case, treasury, bag, venom-bag (of a snake)
  noun (masculine)

यत् (yat) - because (implying 'it is because you do this foolish act, that you wish to fight Arjuna') (which, what, that, because, since)

(indeclinable)

Note: Used here as a causal conjunction or introductory particle to a causal clause.

पार्थम् (pārtham) - Arjuna (Pārtha (Arjuna))

(proper noun)

Accusative, masculine, singular of pārtha

pārtha - Pārtha (son of Pṛthā/Kuntī), an epithet of Arjuna

Derived from Pṛthā (another name for Kuntī) with the aṇ affix, meaning 'son of Pṛthā'.

योद्धुम् (yoddhum) - to fight, for fighting

(indeclinable)

infinitive

Infinitive form derived from the root 'yudh-' (to fight) with the tumun suffix.

Root: yudh (class 4)

इच्छसि (icchasi) - you wish, you desire

(verb)

2nd person , singular, active, present (laṭ) of iṣ

Root: iṣ (class 6)