वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-86, verse-21

राक्षसस्य स्तनाभ्याशे मर्मज्ञो हृदयं प्रति ।
इन्द्राशनिसमस्पर्शं स मुष्टिं विन्यपातयत् ॥२१॥

21. rākṣasasya stanābhyāśe marmajño hṛdayaṃ prati ,
indrāśanisamasparśaṃ sa muṣṭiṃ vinyapātayat.

21. rākṣasasya stanābhyāśe marmajñaḥ hṛdayam prati
indrāśanisamasparśam saḥ muṣṭim vinyapātayat

21. saḥ marmajñaḥ indrāśanisamasparśam muṣṭim
rākṣasasya stanābhyāśe hṛdayam prati vinyapātayat

21. He, a knower of vital spots, brought down his fist, which had an impact like Indra's thunderbolt, near the demon's chest, targeting its heart.

Words meanings summery:

• राक्षसस्य (rākṣasasya) - of the demon

• स्तनाभ्याशे (stanābhyāśe) - near the chest, in the vicinity of the breast

• मर्मज्ञः (marmajñaḥ) - knower of vital spots, skilled in striking vital points

• हृदयम् (hṛdayam) - heart

• प्रति (prati) - towards, to

• इन्द्राशनिसमस्पर्शम् (indrāśanisamasparśam) - whose impact is like Indra's thunderbolt

• सः (saḥ) - he

• मुष्टिम् (muṣṭim) - fist

• विन्यपातयत् (vinyapātayat) - struck down, brought down

Words meanings and morphology

राक्षसस्य (rākṣasasya) - of the demon

(noun)

Genitive, masculine, singular of rākṣasa

rākṣasa - a demon, an evil spirit

Derived from 'rakṣas' with a ('aṇ') suffix.

स्तनाभ्याशे (stanābhyāśe) - near the chest, in the vicinity of the breast

(noun)

Locative, masculine, singular of stanābhyāśa

stanābhyāśa - proximity to the breast/chest

Compound type : tatpuruṣa (stana+abhyāśa)

• stana – breast, udder, chest
  noun (masculine)
• abhyāśa – proximity, vicinity, near
  noun (masculine)

मर्मज्ञः (marmajñaḥ) - knower of vital spots, skilled in striking vital points

(adjective)

Nominative, masculine, singular of marmajña

marmajña - knower of vital parts; one who understands secrets

Compound type : tatpuruṣa (marman+jña)

• marman – a vital spot, vulnerable point; a secret
  noun (neuter)
• jña – knowing, conversant with, knower
  adjective (masculine)
  Suffix -jña from √jñā (to know).
  Root: jñā (class 9)

हृदयम् (hṛdayam) - heart

(noun)

Accusative, neuter, singular of hṛdaya

hṛdaya - heart, mind, soul

प्रति (prati) - towards, to

(indeclinable)

इन्द्राशनिसमस्पर्शम् (indrāśanisamasparśam) - whose impact is like Indra's thunderbolt

(adjective)

Accusative, masculine, singular of indrāśanisamasparśa

indrāśanisamasparśa - having the touch/impact of Indra's thunderbolt

Compound type : bahuvrīhi (indra+aśani+sama+sparśa)

• indra – Indra, king of the gods
  proper noun (masculine)
• aśani – thunderbolt, lightning
  noun (masculine)
• sama – equal, similar, like
  adjective (masculine)
• sparśa – touch, contact, impact
  noun (masculine)
  From root √spṛś (to touch) + ghañ suffix.
  Root: spṛś (class 6)

Note: Modifies 'muṣṭim'.

सः (saḥ) - he

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

मुष्टिम् (muṣṭim) - fist

(noun)

Accusative, masculine, singular of muṣṭi

muṣṭi - fist, a handful

विन्यपातयत् (vinyapātayat) - struck down, brought down

(verb)

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

causative

Causative stem 'pātay-' from root √pat.

Prefixes: vi+ni

Root: pat (class 1)