महाभारतः mahābhārataḥ - book-5, chapter-149, verse-81

महायन्त्राणि नाराचास्तोमरर्ष्टिपरश्वधाः ।
धनूंषि कवचादीनि हृद्यभूवन्नृणां तदा ॥८१॥

81. mahāyantrāṇi nārācāstomararṣṭiparaśvadhāḥ ,
dhanūṁṣi kavacādīni hṛdyabhūvannṛṇāṁ tadā.

81. mahāyantrāṇi nārācāḥ tomaraṛṣṭiparaśvadhāḥ
dhanūṃṣi kavacādīni hṛdyabhūvan nṛṇām tadā

81. tadā mahāyantrāṇi nārācāḥ tomaraṛṣṭiparaśvadhāḥ
dhanūṃṣi kavacādīni nṛṇām hṛdyabhūvan

81. Then, great machines of war, iron arrows, spears, lances, battle-axes, bows, and armors—these and similar weapons—became pleasing to men.

Words meanings summery:

• महायन्त्राणि (mahāyantrāṇi) - great machines of war, powerful weapons (great machines, great instruments, large weapons)

• नाराचाः (nārācāḥ) - iron arrows

• तोमरऋष्टिपरश्वधाः (tomaraṛṣṭiparaśvadhāḥ) - spears, lances, and battle-axes

• धनूंषि (dhanūṁṣi) - bows

• कवचादीनि (kavacādīni) - armors and similar (equipment) (armors and the like, etc.)

• हृद्यभूवन् (hṛdyabhūvan) - they became pleasing (to the men) (they became dear/pleasing)

• नृणाम् (nṛṇām) - to men, for men (of men, to men)

• तदा (tadā) - then, at that time

Words meanings and morphology

महायन्त्राणि (mahāyantrāṇi) - great machines of war, powerful weapons (great machines, great instruments, large weapons)

(noun)

Nominative, neuter, plural of mahāyantra

mahāyantra - great machine, important instrument, large weapon

Compound of 'mahā' (great) and 'yantra' (machine, instrument, weapon).

Compound type : karmadhāraya (mahā+yantra)

• mahā – great, large, mighty
  adjective
  Feminine stem of 'mahat', used as prefix.
• yantra – machine, instrument, weapon, device
  noun (neuter)
  From root 'yam' (to restrain, control) with suffix 'tra'.
  Root: yam (class 1)

Note: One of the subjects of 'hṛdyabhūvan'.

नाराचाः (nārācāḥ) - iron arrows

(noun)

Nominative, masculine, plural of nārāca

nārāca - iron arrow, metallic shaft

Note: One of the subjects of 'hṛdyabhūvan'.

तोमरऋष्टिपरश्वधाः (tomaraṛṣṭiparaśvadhāḥ) - spears, lances, and battle-axes

(noun)

Nominative, masculine, plural of tomaraṛṣṭiparaśvadha

tomaraṛṣṭiparaśvadha - spears, lances, and battle-axes (collectively)

Dvandva compound of 'tomara' (spear), 'ṛṣṭi' (lance), and 'paraśvadha' (battle-axe).

Compound type : dvandva (tomara+ṛṣṭi+paraśvadha)

• tomara – spear, javelin, lance
  noun (masculine)
  Root: tur (class 1)
• ṛṣṭi – lance, spear, javelin
  noun (feminine)
  From root 'ṛṣ' (to go, move) with 'ti' suffix.
  Root: ṛṣ (class 6)
• paraśvadha – battle-axe, axe
  noun (masculine)
  Compound of 'paraśu' (axe) and 'vadha' (killing, striking).
  Root: vad (class 1)

Note: One of the subjects of 'hṛdyabhūvan'.

धनूंषि (dhanūṁṣi) - bows

(noun)

Nominative, neuter, plural of dhanus

dhanus - bow, arc, weapon

Root: dhanv (class 1)

Note: One of the subjects of 'hṛdyabhūvan'.

कवचादीनि (kavacādīni) - armors and similar (equipment) (armors and the like, etc.)

(noun)

Nominative, neuter, plural of kavacādi

kavacādi - armor and the like, etc.

Compound of 'kavaca' (armor) and 'ādi' (beginning, etc.). 'ādi' implies 'and others of that kind'.

Compound type : tatpuruṣa (kavaca+ādi)

• kavaca – armor, mail, cuirass
  noun (neuter)
  Root: kac (class 1)
• ādi – beginning, etc., and the like
  noun (masculine)
  When used as a suffix in compounds, it denotes 'and so forth,' 'etcetera.'
  Root: ād (class 1)

Note: One of the subjects of 'hṛdyabhūvan'.

हृद्यभूवन् (hṛdyabhūvan) - they became pleasing (to the men) (they became dear/pleasing)

(verb)

3rd person , plural, active, imperfect (Laṅ) of hṛdya-bhū

Imperfect Active

Imperfect tense (Laṅ), 3rd person plural, active voice of the root '√bhū' (1st class) used with the adjective 'hṛdya' (pleasing).

Root: bhū (class 1)

नृणाम् (nṛṇām) - to men, for men (of men, to men)

(noun)

Genitive, masculine, plural of nṛ

nṛ - man, person, human being

Irregular declension.

Root: nṛ

तदा (tadā) - then, at that time

(indeclinable)

Derived from the pronoun 'tad' (that) with the suffix '-dā'.