वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-57, verse-87

अथाङ्गदो वज्रसमानवेगं संवर्त्य मुष्टिं गिरिशृङ्गकल्पम् ।
निपातयामास तदा महात्मा नरान्तकस्योरसि वालिपुत्रः ॥८७॥

87. athāṅgado vajrasamānavegaṃ saṃvartya muṣṭiṃ giriśṛṅgakalpam ,
nipātayāmāsa tadā mahātmā narāntakasyorasi vāliputraḥ.

87. atha aṅgadaḥ vajrasamānavegam saṃvartya muṣṭim giriśṛṅgakalpam
nipātayāmāsa tadā mahātmā narāntakasya urasi vāliputraḥ

87. atha mahātmā vāliputraḥ aṅgadaḥ vajrasamānavegam giriśṛṅgakalpam
muṣṭim saṃvartya tadā narāntakasya urasi nipātayāmāsa

87. Then the great-souled Angada, son of Vali, having gathered his fist, which resembled a mountain peak and possessed the force of a thunderbolt, struck it down upon Narantaka's chest.

Words meanings summery:

• अथ (atha) - then (then, now, thereupon)

• अङ्गदः (aṅgadaḥ) - Angada (Angada (name of a Vanara prince))

• वज्रसमानवेगम् (vajrasamānavegam) - (fist) having the force of a thunderbolt (having speed/force equal to a thunderbolt)

• संवर्त्य (saṁvartya) - having gathered (his fist) (having coiled, having gathered, having rolled up)

• मुष्टिम् (muṣṭim) - his fist (fist, handful)

• गिरिशृङ्गकल्पम् (giriśṛṅgakalpam) - (fist) resembling a mountain peak (resembling a mountain peak)

• निपातयामास (nipātayāmāsa) - struck down (struck down, caused to fall, threw down)

• तदा (tadā) - then (then, at that time)

• महात्मा (mahātmā) - the great-souled Angada (great-souled, noble-minded (mahātmā))

• नरान्तकस्य (narāntakasya) - of Narantaka (of Narantaka (name of a demon))

• उरसि (urasi) - on the chest (on the chest, in the breast)

• वालिपुत्रः (vāliputraḥ) - (Angada) son of Vali (son of Vali)

Words meanings and morphology

अथ (atha) - then (then, now, thereupon)

(indeclinable)

अङ्गदः (aṅgadaḥ) - Angada (Angada (name of a Vanara prince))

(proper noun)

Nominative, masculine, singular of aṅgada

aṅgada - Angada (name of Vali's son); an armlet, bracelet

वज्रसमानवेगम् (vajrasamānavegam) - (fist) having the force of a thunderbolt (having speed/force equal to a thunderbolt)

(adjective)

Accusative, masculine, singular of vajrasamānavega

vajrasamānavega - having speed/force equal to a thunderbolt

Compound type : bahuvrihi (vajra+samāna+vega)

• vajra – thunderbolt, diamond
  noun (neuter)
• samāna – equal, similar, same
  adjective (masculine)
• vega – speed, velocity, force, impetuosity
  noun (masculine)

संवर्त्य (saṁvartya) - having gathered (his fist) (having coiled, having gathered, having rolled up)

(indeclinable)

absolutive

derived from root vṛt with prefix sam

Prefix: sam

Root: vṛt (class 1)

मुष्टिम् (muṣṭim) - his fist (fist, handful)

(noun)

Accusative, masculine, singular of muṣṭi

muṣṭi - fist, a handful, hilt of a sword

गिरिशृङ्गकल्पम् (giriśṛṅgakalpam) - (fist) resembling a mountain peak (resembling a mountain peak)

(adjective)

Accusative, masculine, singular of giriśṛṅgakalpa

giriśṛṅgakalpa - resembling a mountain peak

Compound type : tatpurusha (giriśṛṅga+kalpa)

• giri – mountain, hill
  noun (masculine)
• śṛṅga – horn, peak, summit
  noun (neuter)
• kalpa – resembling, like, similar to
  adjective (masculine)

निपातयामास (nipātayāmāsa) - struck down (struck down, caused to fall, threw down)

(verb)

3rd person , singular, active, perfect (lit) of nipātaya

causative perfect

Causative of ni-pat, perfect tense

Prefix: ni

Root: pat (class 1)

Note: periphrastic perfect using root kṛ

तदा (tadā) - then (then, at that time)

(indeclinable)

महात्मा (mahātmā) - the great-souled Angada (great-souled, noble-minded (mahātmā))

(adjective)

Nominative, masculine, singular of mahāātman

mahāātman - great-souled, noble-minded, exalted (mahātmā)

Compound type : bahuvrihi (mahā+ātman)

• mahā – great, large, mighty
  adjective (masculine)
• ātman – self, soul, spirit, essence (ātman)
  noun (masculine)

Note: Refers to Angada

नरान्तकस्य (narāntakasya) - of Narantaka (of Narantaka (name of a demon))

(proper noun)

Genitive, masculine, singular of narāntaka

narāntaka - destroyer of men, Narantaka (a demon)

Compound type : tatpurusha (nara+antaka)

• nara – man, human being
  noun (masculine)
• antaka – ender, destroyer, death, Yama
  noun (masculine)
  derived from root ant
  Root: ant (class 1)

उरसि (urasi) - on the chest (on the chest, in the breast)

(noun)

Locative, neuter, singular of uras

uras - chest, breast, bosom

वालिपुत्रः (vāliputraḥ) - (Angada) son of Vali (son of Vali)

(proper noun)

Nominative, masculine, singular of vāliputra

vāliputra - son of Vali

Compound type : tatpurusha (vālin+putra)

• vālin – Vali (name of the monkey king)
  proper noun (masculine)
• putra – son
  noun (masculine)

Note: In apposition to Aṅgadaḥ