वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-7, chapter-75, verse-13

यद्यसौ तप आतिष्ठेद्भूय एव सुरेश्वर ।
यावल् लोका धरिष्यन्ति तावदस्य वशानुगाः ॥१३॥

13. yadyasau tapa ātiṣṭhedbhūya eva sureśvara ,
yāval lokā dhariṣyanti tāvadasya vaśānugāḥ.

13. yadi asau tapas ātiṣṭhet bhūyaḥ eva sureśvara
| yāvat lokā dhariṣyanti tāvat asya vaśānugāḥ

13. sureśvara,
yadi asau bhūyaḥ eva tapas ātiṣṭhet,
yāvat lokā dhariṣyanti,
tāvat asya vaśānugāḥ (bhaviṣyanti)

13. O lord of the gods, if he were again to undertake (severe) austerity (tapas), then as long as the worlds endure, they would remain subservient to him.

Words meanings summery:

• यदि (yadi) - if; in case that

• असौ (asau) - referring to Vṛtra (he; that one)

• तपस् (tapas) - severe spiritual practices or asceticism (tapas) (austerity; spiritual discipline; heat)

• आतिष्ठेत् (ātiṣṭhet) - he would engage in or perform (austerity) (he should undertake; he would perform; he would stand in)

• भूयः (bhūyaḥ) - once again, a second time (again; further; more)

• एव (eva) - emphasizing 'again' (only; just; indeed)

• सुरेश्वर (sureśvara) - O Indra, chief of the gods (O lord of the gods)

• यावत् (yāvat) - for the entire duration that (as long as; as far as; until)

• लोका (lokā) - the various worlds of existence (worlds; realms; people)

• धरिष्यन्ति (dhariṣyanti) - the worlds will continue to exist or be sustained (they will endure; they will hold; they will support)

• तावत् (tāvat) - for that same duration (then; so long; that much)

• अस्य (asya) - referring to Vṛtra (of him; his; of this)

• वशानुगाः (vaśānugāḥ) - remaining under his control and obedience (following his will; subservient; obedient)

Words meanings and morphology

यदि (yadi) - if; in case that

(indeclinable)

असौ (asau) - referring to Vṛtra (he; that one)

(pronoun)

Nominative, masculine, singular of adas

adas - that one; he/she/it (referring to something distant or specific)

तपस् (tapas) - severe spiritual practices or asceticism (tapas) (austerity; spiritual discipline; heat)

(noun)

Accusative, neuter, singular of tapas

tapas - austerity; heat; penance; spiritual fervor

Root: tap (class 1)

आतिष्ठेत् (ātiṣṭhet) - he would engage in or perform (austerity) (he should undertake; he would perform; he would stand in)

(verb)

3rd person , singular, active, optative (vidhi liṅ) of ātiṣṭh

From √sthā (to stand) with prefix ā-

Prefix: ā

Root: sthā (class 1)

भूयः (bhūyaḥ) - once again, a second time (again; further; more)

(indeclinable)

एव (eva) - emphasizing 'again' (only; just; indeed)

(indeclinable)

सुरेश्वर (sureśvara) - O Indra, chief of the gods (O lord of the gods)

(noun)

Vocative, masculine, singular of sureśvara

sureśvara - lord of the gods; sovereign of the gods (often refers to Indra)

Compound type : tatpuruṣa (sura+īśvara)

• sura – god; deity
  noun (masculine)
• īśvara – lord; master; ruler
  noun (masculine)
  Root: īś (class 2)

यावत् (yāvat) - for the entire duration that (as long as; as far as; until)

(indeclinable)

लोका (lokā) - the various worlds of existence (worlds; realms; people)

(noun)

Nominative, masculine, plural of loka

loka - world; realm; people

धरिष्यन्ति (dhariṣyanti) - the worlds will continue to exist or be sustained (they will endure; they will hold; they will support)

(verb)

3rd person , plural, active, future (lṛṭ) of dhṛ

Root: dhṛ (class 1)

तावत् (tāvat) - for that same duration (then; so long; that much)

(indeclinable)

अस्य (asya) - referring to Vṛtra (of him; his; of this)

(pronoun)

Genitive, masculine, singular of idam

idam - this; he/she/it

वशानुगाः (vaśānugāḥ) - remaining under his control and obedience (following his will; subservient; obedient)

(adjective)

Nominative, masculine, plural of vaśānuga

vaśānuga - following one's will; obedient; subservient

Compound type : tatpuruṣa (vaśa+anuga)

• vaśa – will; control; power; subjugation
  noun (masculine)
• anuga – following; accompanied by; obedient
  adjective (masculine)
  From √gam (to go) with prefix anu-
  Prefix: anu
  Root: gam (class 1)