महाभारतः mahābhārataḥ - book-7, chapter-137, verse-51

भीमस्य निघ्नतः शत्रून्पार्ष्णिं जग्राह पाण्डवः ।
द्रोणोऽपि पाण्डुपाञ्चालान्व्यधमद्रजनीमुखे ॥५१॥

51. bhīmasya nighnataḥ śatrūnpārṣṇiṁ jagrāha pāṇḍavaḥ ,
droṇo'pi pāṇḍupāñcālānvyadhamadrajanīmukhe.

51. bhīmasya nighnataḥ śatrūn pārṣṇim jagrāha pāṇḍavaḥ
droṇaḥ api pāṇḍupāñcālān vyadhamat rajanīmukhe

51. pāṇḍavaḥ bhīmasya śatrūn nighnataḥ pārṣṇim jagrāha
api ca droṇaḥ rajanīmukhe pāṇḍupāñcālān vyadhamat

51. While Bhīma was slaying enemies, a Pāṇḍava attacked their rear flank. Droṇa, on the other hand, even at the beginning of the night, continued to harass the Pāṇḍavas and Pāñcālas.

Words meanings summery:

• भीमस्य (bhīmasya) - of Bhima

• निघ्नतः (nighnataḥ) - slaying, striking, killing (genitive singular masculine)

• शत्रून् (śatrūn) - enemies

• पार्ष्णिम् (pārṣṇim) - rear flank (of the enemy army) (rear, heel, flank)

• जग्राह (jagrāha) - attacked, seized (seized, grasped, attacked, took)

• पाण्डवः (pāṇḍavaḥ) - one of the Pāṇḍava brothers (not Bhima, but another) (son of Pāṇḍu, a Pāṇḍava)

• द्रोणः (droṇaḥ) - Droṇa (name of a preceptor)

• अपि (api) - even (emphasizing the time) (also, even, too)

• पाण्डुपाञ्चालान् (pāṇḍupāñcālān) - the armies of the Pāṇḍavas and Pāñcālas (Pāṇḍus and Pāñcālas)

• व्यधमत् (vyadhamat) - harassed, distressed (harassed, agitated, scattered, blew away)

• रजनीमुखे (rajanīmukhe) - at the onset of darkness (at the beginning of the night)

Words meanings and morphology

भीमस्य (bhīmasya) - of Bhima

(proper noun)

Genitive, masculine, singular of bhīma

bhīma - dreadful, terrible; a proper name (Bhima)

निघ्नतः (nighnataḥ) - slaying, striking, killing (genitive singular masculine)

(participle)

Genitive, masculine, singular of nighnat

nighnat - slaying, killing, striking

present active participle

derived from root √han (to strike, kill) with prefix ni-, present participle suffix -at

Prefix: ni

Root: han (class 2)

Note: Used in a genitive absolute construction with bhīmasya.

शत्रून् (śatrūn) - enemies

(noun)

Accusative, masculine, plural of śatru

śatru - enemy, foe, rival

पार्ष्णिम् (pārṣṇim) - rear flank (of the enemy army) (rear, heel, flank)

(noun)

Accusative, feminine, singular of pārṣṇi

pārṣṇi - heel, rear, rear-guard, flank

जग्राह (jagrāha) - attacked, seized (seized, grasped, attacked, took)

(verb)

3rd person , singular, active, perfect (liṭ) of grah

perfect active

Reduplicated perfect form of √grah

Root: grah (class 9)

पाण्डवः (pāṇḍavaḥ) - one of the Pāṇḍava brothers (not Bhima, but another) (son of Pāṇḍu, a Pāṇḍava)

(proper noun)

Nominative, masculine, singular of pāṇḍava

pāṇḍava - descendant of Pāṇḍu, a Pāṇḍava

patronymic from Pāṇḍu

Note: Refers to one of the Pāṇḍava brothers.

द्रोणः (droṇaḥ) - Droṇa (name of a preceptor)

(proper noun)

Nominative, masculine, singular of droṇa

droṇa - a type of measure; a proper name (Droṇa)

अपि (api) - even (emphasizing the time) (also, even, too)

(indeclinable)

पाण्डुपाञ्चालान् (pāṇḍupāñcālān) - the armies of the Pāṇḍavas and Pāñcālas (Pāṇḍus and Pāñcālas)

(noun)

Accusative, masculine, plural of pāṇḍupāñcāla

pāṇḍupāñcāla - Pāṇḍus and Pāñcālas

Compound type : dvandva (pāṇḍu+pāñcāla)

• pāṇḍu – Pāṇḍu; a Pāṇḍava
  proper noun (masculine)
• pāñcāla – Pāñcāla (name of a country or its king/people)
  proper noun (masculine)

Note: Refers to the collective Pāṇḍava and Pāñcāla forces.

व्यधमत् (vyadhamat) - harassed, distressed (harassed, agitated, scattered, blew away)

(verb)

3rd person , singular, active, imperfect (laṅ) of vyadham

imperfect active

derived from root √dham (to blow, agitate) with prefix vi-

Prefix: vi

Root: dham (class 1)

रजनीमुखे (rajanīmukhe) - at the onset of darkness (at the beginning of the night)

(noun)

Locative, neuter, singular of rajanīmukha

rajanīmukha - beginning of night, evening

Compound type : tatpuruṣa (rajanī+mukha)

• rajanī – night
  noun (feminine)
• mukha – mouth, face, beginning, front
  noun (neuter)