महाभारतः mahābhārataḥ - book-10, chapter-3, verse-33

अद्य पाञ्चालराजस्य धृष्टद्युम्नस्य वै निशि ।
विरात्रे प्रमथिष्यामि पशोरिव शिरो बलात् ॥३३॥

33. adya pāñcālarājasya dhṛṣṭadyumnasya vai niśi ,
virātre pramathiṣyāmi paśoriva śiro balāt.

33. adya pāñcālarājasya dhṛṣṭadyumnasya vai niśi
virātre pramathiṣyāmi paśoḥ iva śiraḥ balāt

33. adya aham vai niśi virātre balāt paśoḥ iva
pāñcālarājasya dhṛṣṭadyumnasya śiraḥ pramathiṣyāmi

33. Today, indeed, in the dead of night, I will crush the head of Dhṛṣṭadyumna, the king of Pañcāla, by force, just as one crushes an animal's head.

Words meanings summery:

• अद्य (adya) - today, now

• पाञ्चालराजस्य (pāñcālarājasya) - of the king of Pañcāla

• धृष्टद्युम्नस्य (dhṛṣṭadyumnasya) - of Dhṛṣṭadyumna

• वै (vai) - indeed, certainly

• निशि (niśi) - at night

• विरात्रे (virātre) - in the dead of night, in the late night

• प्रमथिष्यामि (pramathiṣyāmi) - I will crush, I will churn, I will destroy

• पशोः (paśoḥ) - of an animal, of a beast

• इव (iva) - like, as, as if

• शिरः (śiraḥ) - head

• बलात् (balāt) - by force, forcefully

Words meanings and morphology

अद्य (adya) - today, now

(indeclinable)

पाञ्चालराजस्य (pāñcālarājasya) - of the king of Pañcāla

(proper noun)

Genitive, masculine, singular of pāñcālarāja

pāñcālarāja - king of the Pañcālas

Tatpuruṣa compound: 'king (rāja) of the Pañcālas'

Compound type : ṣaṣṭhī-tatpuruṣa (pāñcāla+rāja)

• pāñcāla – Pañcāla (name of a country or its people)
  proper noun (masculine)
• rāja – king, ruler
  noun (masculine)

धृष्टद्युम्नस्य (dhṛṣṭadyumnasya) - of Dhṛṣṭadyumna

(proper noun)

Genitive, masculine, singular of dhṛṣṭadyumna

dhṛṣṭadyumna - Dhṛṣṭadyumna (son of Drupada, commander of Pāṇḍava army, slayer of Droṇa)

वै (vai) - indeed, certainly

(indeclinable)

निशि (niśi) - at night

(noun)

Locative, feminine, singular of niś

niś - night

विरात्रे (virātre) - in the dead of night, in the late night

(noun)

Locative, neuter, singular of virātra

virātra - dead of night, late night

compound of vi ('apart, without') and rātra ('night')

Compound type : prādi-tatpuruṣa (vi+rātra)

• vi – asunder, apart, away, without
  indeclinable
  prefix
• rātra – night (usually used in compounds)
  noun (neuter)
  from rātri ('night')

प्रमथिष्यामि (pramathiṣyāmi) - I will crush, I will churn, I will destroy

(verb)

1st person , singular, active, future (lṛṭ) of pramath

future active

1st person singular, future tense, active voice, from root math with upasarga pra-

Prefix: pra

Root: math (class 1)

पशोः (paśoḥ) - of an animal, of a beast

(noun)

Genitive, masculine, singular of paśu

paśu - animal, beast, cattle

इव (iva) - like, as, as if

(indeclinable)

शिरः (śiraḥ) - head

(noun)

Accusative, neuter, singular of śiras

śiras - head, top, peak

बलात् (balāt) - by force, forcefully

(indeclinable)

ablative singular used adverbially

Note: Used adverbially to mean 'forcefully'.