महाभारतः mahābhārataḥ - book-5, chapter-47, verse-28

यदाभिमन्युः परवीरघाती शरैः परान्मेघ इवाभिवर्षन् ।
विगाहिता कृष्णसमः कृतास्त्रस्तदा युद्धं धार्तराष्ट्रोऽन्वतप्स्यत् ॥२८॥

28. yadābhimanyuḥ paravīraghātī; śaraiḥ parānmegha ivābhivarṣan ,
vigāhitā kṛṣṇasamaḥ kṛtāstra;stadā yuddhaṁ dhārtarāṣṭro'nvatapsyat.

28. yadā abhimanyuḥ paravīraghātī śaraiḥ
parān meghaḥ iva abhivarṣan
vigāhitā kṛṣṇasamaḥ kṛtāstraḥ tadā
yuddham dhārtarāṣṭraḥ anvatapsyat

28. When Abhimanyu, the slayer of enemy heroes, showering arrows upon his foes like a cloud, skilled in weaponry and equal to Kṛṣṇa, would plunge into battle, then Dhṛtarāṣṭra would lament the war.

Words meanings summery:

• यदा (yadā) - when

• अभिमन्युः (abhimanyuḥ) - Abhimanyu

• परवीरघाती (paravīraghātī) - slayer of enemy heroes

• शरैः (śaraiḥ) - by arrows

• परान् (parān) - enemies

• मेघः (meghaḥ) - a cloud

• इव (iva) - like, as if

• अभिवर्षन् (abhivarṣan) - showering upon, raining upon

• विगाहिता (vigāhitā) - one who plunges, would plunge (into battle)

• कृष्णसमः (kṛṣṇasamaḥ) - equal to Kṛṣṇa, like Kṛṣṇa

• कृतास्त्रः (kṛtāstraḥ) - skilled in weaponry, one who has acquired weapons

• तदा (tadā) - then

• युद्धम् (yuddham) - the war, battle

• धार्तराष्ट्रः (dhārtarāṣṭraḥ) - Dhṛtarāṣṭra (the king, father of the Kauravas) (Dhṛtarāṣṭra (son of Dhṛtarāṣṭra))

• अन्वतप्स्यत् (anvatapsyat) - would lament, would regret

Words meanings and morphology

यदा (yadā) - when

(indeclinable)

अभिमन्युः (abhimanyuḥ) - Abhimanyu

(proper noun)

Nominative, masculine, singular of abhimanyu

abhimanyu - Abhimanyu (son of Arjuna and Subhadrā)

परवीरघाती (paravīraghātī) - slayer of enemy heroes

(adjective)

Nominative, masculine, singular of paravīraghātī

paravīraghātī - slayer of enemy heroes

derived from ghātin (agent noun)

Compound type : tatpuruṣa (para+vīra+ghātin)

• para – other, enemy
  adjective (masculine)
• vīra – hero, warrior
  noun (masculine)
• ghātin – killing, destroying, slayer
  noun (masculine)
  agent noun from root han (to strike/kill)
  Root: han (class 2)

Note: Compound adjective modifying Abhimanyu

शरैः (śaraiḥ) - by arrows

(noun)

Instrumental, masculine, plural of śara

śara - arrow

परान् (parān) - enemies

(adjective)

Accusative, masculine, plural of para

para - other, supreme, enemy

Note: Used substantively as 'enemies'

मेघः (meghaḥ) - a cloud

(noun)

Nominative, masculine, singular of megha

megha - cloud

Root: mih (class 1)

इव (iva) - like, as if

(indeclinable)

अभिवर्षन् (abhivarṣan) - showering upon, raining upon

(adjective)

Nominative, masculine, singular of abhivarṣant

abhivarṣant - showering upon, raining upon, sprinkling

present active participle

from root vṛṣ with prefix abhi

Prefix: abhi

Root: vṛṣ (class 1)

Note: Modifies Abhimanyu, acting as a cloud.

विगाहिता (vigāhitā) - one who plunges, would plunge (into battle)

(noun)

Nominative, masculine, singular of vigāhitṛ

vigāhitṛ - one who plunges or enters deeply

agent noun

from root gāh with prefix vi

Prefix: vi

Root: gāh (class 1)

Note: Agent noun describing Abhimanyu.

कृष्णसमः (kṛṣṇasamaḥ) - equal to Kṛṣṇa, like Kṛṣṇa

(adjective)

Nominative, masculine, singular of kṛṣṇasama

kṛṣṇasama - equal to Kṛṣṇa

Compound type : tatpuruṣa (kṛṣṇa+sama)

• kṛṣṇa – Kṛṣṇa
  proper noun (masculine)
• sama – equal, similar
  adjective (masculine)

Note: Modifies Abhimanyu.

कृतास्त्रः (kṛtāstraḥ) - skilled in weaponry, one who has acquired weapons

(adjective)

Nominative, masculine, singular of kṛtāstra

kṛtāstra - one who has acquired weapons, skilled in weaponry

Compound type : bahuvrīhi (kṛta+astra)

• kṛta – done, made, accomplished, acquired
  past passive participle (masculine)
  Past Passive Participle
  from root kṛ
  Root: kṛ (class 8)
• astra – weapon
  noun (neuter)

Note: Modifies Abhimanyu.

तदा (tadā) - then

(indeclinable)

युद्धम् (yuddham) - the war, battle

(noun)

Accusative, neuter, singular of yuddha

yuddha - war, battle, fight

Past Passive Participle (used substantively)

from root yudh

Root: yudh (class 4)

Note: Object of 'anvatapsyat'.

धार्तराष्ट्रः (dhārtarāṣṭraḥ) - Dhṛtarāṣṭra (the king, father of the Kauravas) (Dhṛtarāṣṭra (son of Dhṛtarāṣṭra))

(proper noun)

Nominative, masculine, singular of dhārtarāṣṭra

dhārtarāṣṭra - son of Dhṛtarāṣṭra, belonging to Dhṛtarāṣṭra

patronymic from Dhṛtarāṣṭra

Note: Subject of 'anvatapsyat'.

अन्वतप्स्यत् (anvatapsyat) - would lament, would regret

(verb)

3rd person , singular, active, past imperfect (laṅ) of anutap

from root tap with prefix anu

Prefix: anu

Root: tap (class 1)

Note: Often used in conditional 'yada...tada' clauses to indicate 'would' or 'then'.