योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-21, verse-11

यदा शेषाकृतिं रुद्रो नसमाप्तैकचेष्टिताम् ।
ययौ गरुत्मान्ब्रह्माण्डं तदा नाकम्पत द्रुमः ॥ ११ ॥

yadā śeṣākṛtiṃ rudro nasamāptaikaceṣṭitām ,
yayau garutmānbrahmāṇḍaṃ tadā nākampata drumaḥ 11

11. yadā śeṣākṛtim rudraḥ nasamāptaikaceṣṭitām yayau
garutmān brahmāṇḍam tadā na akampata drumaḥ

11. yadā rudraḥ garutmān nasamāptaikaceṣṭitām
śeṣākṛtim brahmāṇḍam yayau tadā drumaḥ na akampata

11. When the winged Rudra, assuming the form of Shesha (śeṣākṛti) — a form whose single endeavor was not yet complete — went to the cosmic egg (brahmāṇḍa), even then, this tree did not tremble.

Words meanings summery:

• यदा (yadā) - when, at which time

• शेषाकृतिम् (śeṣākṛtim) - the form of Shesha

• रुद्रः (rudraḥ) - Rudra (a Vedic deity, later identified with Shiva)

• नसमाप्तैकचेष्टिताम् (nasamāptaikaceṣṭitām) - whose single endeavor was not yet complete (whose single act was not yet finished / incomplete single effort)

• ययौ (yayau) - went

• गरुत्मान् (garutmān) - the winged (Rudra) (winged, having wings; Garuda)

• ब्रह्माण्डम् (brahmāṇḍam) - cosmic egg, the universe

• तदा (tadā) - then, at that time

• न (na) - not, no

• अकम्पत (akampata) - trembled

• द्रुमः (drumaḥ) - tree

Words meanings and morphology

यदा (yadā) - when, at which time

(indeclinable)

adverbial derivative of relative pronoun ya

शेषाकृतिम् (śeṣākṛtim) - the form of Shesha

(noun)

Accusative, feminine, singular of śeṣākṛti

śeṣākṛti - form of Shesha, shape of Shesha

Compound type : tatpurusha (śeṣa+ākṛti)

• śeṣa – Shesha (the divine serpent, Ananta)
  proper noun (masculine)
• ākṛti – form, shape, appearance
  noun (feminine)
  from ā-kṛ (to make, to form)
  Prefix: ā
  Root: kṛ (class 8)

रुद्रः (rudraḥ) - Rudra (a Vedic deity, later identified with Shiva)

(proper noun)

Nominative, masculine, singular of rudra

rudra - Rudra, the roaring one, a Vedic deity associated with wind, storm, and hunting

Root: rud (class 2)

नसमाप्तैकचेष्टिताम् (nasamāptaikaceṣṭitām) - whose single endeavor was not yet complete (whose single act was not yet finished / incomplete single effort)

(adjective)

Accusative, feminine, singular of nasamāptaikaceṣṭita

nasamāptaikaceṣṭita - whose one effort is not completed

Compound type : bahuvrihi (na+samāpta+eka+ceṣṭita)

• na – not
  indeclinable
• samāpta – finished, completed
  adjective (neuter)
  Past Passive Participle
  from sam-āp (to obtain, to finish)
  Prefix: sam
  Root: āp (class 5)
• eka – one, single
  numeral/adjective (masculine)
• ceṣṭita – effort, action, activity
  noun (neuter)
  Past Passive Participle
  from ceṣṭ (to move, to endeavor)
  Root: ceṣṭ (class 1)

Note: modifies śeṣākṛtim

ययौ (yayau) - went

(verb)

3rd person , singular, active, past perfect (liṭ) of yā

perfect 3rd singular

Root: yā (class 2)

गरुत्मान् (garutmān) - the winged (Rudra) (winged, having wings; Garuda)

(adjective)

Nominative, masculine, singular of garutmat

garutmat - winged, having wings; Garuda

from garut (wing) + -mat (possessive suffix)

Note: masculine nominative singular, modifying Rudra

ब्रह्माण्डम् (brahmāṇḍam) - cosmic egg, the universe

(noun)

Accusative, neuter, singular of brahmāṇḍa

brahmāṇḍa - the cosmic egg, the universe (literally, 'Brahma's egg')

Compound type : tatpurusha (brahma+aṇḍa)

• brahma – Brahma (the creator deity); the absolute reality (brahman)
  proper noun (masculine)
• aṇḍa – egg
  noun (neuter)

तदा (tadā) - then, at that time

(indeclinable)

adverbial derivative of demonstrative pronoun ta

न (na) - not, no

(indeclinable)

अकम्पत (akampata) - trembled

(verb)

3rd person , singular, middle, past imperfect (laṅ) of kamp

imperfect 3rd singular, middle voice

Root: kamp (class 1)

द्रुमः (drumaḥ) - tree

(noun)

Nominative, masculine, singular of druma

druma - tree, forest