वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-97, verse-21

गतासुर्भीमवेगस्तु नैरृतेन्द्रो महाद्युतिः ।
पपात स्यन्दनाद्भूमौ वृत्रो वज्रहतो यथा ॥२१॥

21. gatāsurbhīmavegastu nairṛtendro mahādyutiḥ ,
papāta syandanādbhūmau vṛtro vajrahato yathā.

21. gatāsuḥ bhīmavegaḥ tu nairṛtendrah mahādyutiḥ
papāta syandanāt bhūmau vṛtraḥ vajrahataḥ yathā

21. tu nairṛtendrah bhīmavegaḥ mahādyutiḥ gatāsuḥ
syandanāt bhūmau papāta yathā vṛtraḥ vajrahataḥ

21. Indeed, the lord of the rākṣasas (nairṛtendro), of formidable might and great splendor, fell from his chariot onto the ground, lifeless, just as Vṛtra was struck by the thunderbolt (vajra).

Words meanings summery:

• गतासुः (gatāsuḥ) - the demon lord, now lifeless (lifeless, deceased, whose life has departed)

• भीमवेगः (bhīmavegaḥ) - the demon lord, who possessed formidable might (of formidable speed/might, terribly swift/forceful)

• तु (tu) - but, indeed, on the other hand

• नैरृतेन्द्रह् (nairṛtendrah) - the demon leader being described, often Rāvaṇa or one of his generals (lord of the rākṣasas, chief of the demons)

• महाद्युतिः (mahādyutiḥ) - the demon lord, possessing great splendor (of great splendor, greatly radiant)

• पपात (papāta) - fell, fell down

• स्यन्दनात् (syandanāt) - from the chariot

• भूमौ (bhūmau) - on the ground, on the earth

• वृत्रः (vṛtraḥ) - the Vedic demon Vṛtra (Vṛtra (name of a demon))

• वज्रहतः (vajrahataḥ) - Vṛtra, who was struck by Indra's thunderbolt (struck by the thunderbolt, smitten by vajra)

• यथा (yathā) - just as, as, like

Words meanings and morphology

गतासुः (gatāsuḥ) - the demon lord, now lifeless (lifeless, deceased, whose life has departed)

(adjective)

Nominative, masculine, singular of gatāsu

gatāsu - lifeless, dead, whose breath has gone

From gata (gone) + asu (life breath)

Compound type : Bahuvrīhi (gata+asu)

• gata – gone, departed, past
  adjective (masculine)
  Past Passive Participle
  From root gam (to go)
  Root: gam (class 1)
• asu – life, breath, vital breath
  noun (masculine)

Note: Refers to Nairṛtendrah.

भीमवेगः (bhīmavegaḥ) - the demon lord, who possessed formidable might (of formidable speed/might, terribly swift/forceful)

(adjective)

Nominative, masculine, singular of bhīmavega

bhīmavega - of terrible speed or force, impetuous

From bhīma (terrible) + vega (speed, force)

Compound type : Bahuvrīhi (bhīma+vega)

• bhīma – terrible, dreadful, fearful
  adjective (masculine)
  From root bhī (to fear)
  Root: bhī (class 3)
• vega – speed, velocity, force, impetus
  noun (masculine)
  From root vij (to tremble, move quickly)
  Root: vij (class 6)

Note: Refers to Nairṛtendrah.

तु (tu) - but, indeed, on the other hand

(indeclinable)

नैरृतेन्द्रह् (nairṛtendrah) - the demon leader being described, often Rāvaṇa or one of his generals (lord of the rākṣasas, chief of the demons)

(noun)

Nominative, masculine, singular of nairṛtendra

nairṛtendra - lord of the rākṣasas, chief of the demons

From Nairṛta (a class of demons, or related to Nirṛti) + indra (lord)

Compound type : Tatpuruṣa (nairṛta+indra)

• nairṛta – a demon, a rākṣasa, belonging to Nirṛti
  noun (masculine)
  From Nirṛti, deity of dissolution
• indra – lord, chief, ruler
  noun (masculine)

Note: Subject of 'papāta'.

महाद्युतिः (mahādyutiḥ) - the demon lord, possessing great splendor (of great splendor, greatly radiant)

(adjective)

Nominative, masculine, singular of mahādyuti

mahādyuti - of great splendor or radiance

From mahā (great) + dyuti (splendor)

Compound type : Bahuvrīhi (mahā+dyuti)

• mahā – great, large, mighty
  adjective
  Feminine stem of mahant, used as prefix in compounds
• dyuti – splendor, radiance, light
  noun (feminine)
  From root dyut (to shine)
  Root: dyut (class 1)

Note: Refers to Nairṛtendrah.

पपात (papāta) - fell, fell down

(verb)

3rd person , singular, active, past perfect (Lit) of pat

Reduplicated perfect form (Lit)

Root: pat (class 1)

स्यन्दनात् (syandanāt) - from the chariot

(noun)

Ablative, masculine, singular of syandana

syandana - chariot, flowing, stream

From root syand (to flow, move quickly)

Root: syand (class 1)

भूमौ (bhūmau) - on the ground, on the earth

(noun)

Locative, feminine, singular of bhūmi

bhūmi - ground, earth, land

वृत्रः (vṛtraḥ) - the Vedic demon Vṛtra (Vṛtra (name of a demon))

(proper noun)

Nominative, masculine, singular of vṛtra

vṛtra - Vṛtra (a Vedic demon slain by Indra)

Note: Part of the simile.

वज्रहतः (vajrahataḥ) - Vṛtra, who was struck by Indra's thunderbolt (struck by the thunderbolt, smitten by vajra)

(adjective)

Nominative, masculine, singular of vajrahata

vajrahata - struck by a thunderbolt, smitten by vajra

From vajra (thunderbolt) + hata (struck, killed)

Compound type : Tatpuruṣa (vajra+hata)

• vajra – thunderbolt, diamond
  noun (masculine)
• hata – struck, killed, smitten
  adjective (masculine)
  Past Passive Participle
  From root han (to strike, kill)
  Root: han (class 2)

Note: Qualifies Vṛtra.

यथा (yathā) - just as, as, like

(indeclinable)