योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-49, verse-12

श्यामाश्यामं पिशाचास्त्रमथ सिन्धुरचोदयत् ।
तेनोदगुः पिशाचानां पङ्क्तयोऽत्यन्तभीतिदाः ॥ १२ ॥

śyāmāśyāmaṃ piśācāstramatha sindhuracodayat ,
tenodaguḥ piśācānāṃ paṅktayo'tyantabhītidāḥ 12

12. śyāmāśyāmam piśācāstram atha sindhuḥ acodayat
tena udaguḥ piśācānām paṅktayaḥ atyantabhītidaḥ

12. atha sindhuḥ śyāmāśyāmam piśācāstram acodayat
tena piśācānām atyantabhītidaḥ paṅktayaḥ udaguḥ

12. Then Sindhu unleashed the intensely dark Piśāca weapon. From it, hordes of piśācas (demons) arose, causing extreme terror.

Words meanings summery:

• श्यामाश्यामम् (śyāmāśyāmam) - intensely dark (describing the weapon) (dark-black, intensely dark)

• पिशाचास्त्रम् (piśācāstram) - the Piśāca weapon

• अथ (atha) - then, next, thereafter

• सिन्धुः (sindhuḥ) - Sindhu (name of a king/person) (Sindhu (a river, the Indus; a country, its ruler))

• अचोदयत् (acodayat) - he launched, he unleashed (he urged, he impelled, he launched)

• तेन (tena) - by that (weapon) (by that, with that)

• उदगुः (udaguḥ) - they arose (from the weapon) (they rose up, they appeared)

• पिशाचानाम् (piśācānām) - of piśācas, of demons

• पङ्क्तयः (paṅktayaḥ) - hordes (of demons) (rows, lines, hordes, multitudes)

• अत्यन्तभीतिदः (atyantabhītidaḥ) - extremely terrifying (extremely fear-giving, terrifying)

Words meanings and morphology

श्यामाश्यामम् (śyāmāśyāmam) - intensely dark (describing the weapon) (dark-black, intensely dark)

(adjective)

Accusative, neuter, singular of śyāmāśyāma

śyāmāśyāma - dark-black, intensely dark

Compound type : karmadharaya (śyāma+śyāma)

• śyāma – dark, black, dark-blue
  adjective (masculine)
• śyāma – dark, black, dark-blue
  adjective (masculine)

Note: Agrees with piśācāstram.

पिशाचास्त्रम् (piśācāstram) - the Piśāca weapon

(noun)

Accusative, neuter, singular of piśācāstra

piśācāstra - weapon of piśācas (demons/goblins)

Compound type : tatpurusha (piśāca+astra)

• piśāca – goblin, demon, fiend
  noun (masculine)
• astra – missile, weapon
  noun (neuter)
  Root: as (class 4)

अथ (atha) - then, next, thereafter

(indeclinable)

सिन्धुः (sindhuḥ) - Sindhu (name of a king/person) (Sindhu (a river, the Indus; a country, its ruler))

(proper noun)

Nominative, masculine, singular of sindhu

sindhu - river, ocean, Indus (river), Sindhu (region/people/king)

अचोदयत् (acodayat) - he launched, he unleashed (he urged, he impelled, he launched)

(verb)

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

imperfect (causative)

Causative of root cud, 3rd person singular, active voice. Formed with secondary suffix -aya.

Root: cud (class 10)

तेन (tena) - by that (weapon) (by that, with that)

(pronoun)

Instrumental, neuter, singular of tad

tad - that

Note: Refers to 'piśācāstram'.

उदगुः (udaguḥ) - they arose (from the weapon) (they rose up, they appeared)

(verb)

3rd person , plural, active, past perfect (lit) of gam

perfect

root gam with upasarga ut; 3rd person plural, active voice. The perfect stem is ja-gā/ja-gmu. For ut-gam, it's udaguḥ.

Prefix: ut

Root: gam (class 1)

पिशाचानाम् (piśācānām) - of piśācas, of demons

(noun)

Genitive, masculine, plural of piśāca

piśāca - goblin, demon, fiend

पङ्क्तयः (paṅktayaḥ) - hordes (of demons) (rows, lines, hordes, multitudes)

(noun)

Nominative, feminine, plural of paṅkti

paṅkti - row, line, series, multitude, horde

अत्यन्तभीतिदः (atyantabhītidaḥ) - extremely terrifying (extremely fear-giving, terrifying)

(adjective)

Nominative, feminine, plural of atyantabhītida

atyantabhītida - causing extreme fear, extremely terrifying

Compound formed from atyanta (extreme) and bhītida (causing fear). Bhītida itself is from bhīti (fear) and -da (giver/causer, from root dā 'to give').

Compound type : karmadharaya (atyanta+bhītida)

• atyanta – extreme, excessive
  adjective (masculine)
  Prefix: ati
  Root: ant
• bhītida – causing fear, terrifying
  adjective (masculine)
  Compound of bhīti (fear) + -da (giver/causer, from root dā).
  Root: dā (class 3)

Note: Agrees with paṅktayaḥ.