योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-111, verse-21

आत्मीयदेशसैन्यानां श्रेयोर्थं शान्तयेऽनलम् ।
नमस्कृत्याथ जप्त्वाशु स तत्तत्याज दारुणम् ॥ २१ ॥

ātmīyadeśasainyānāṃ śreyorthaṃ śāntaye'nalam ,
namaskṛtyātha japtvāśu sa tattatyāja dāruṇam 21

21. ātmīyadeśasainyānām śreyortham śāntaye analam
namaskṛtya atha japtvā āśu saḥ tat tatyāja dāruṇam

21. saḥ ātmīyadeśasainyānām śreyortham śāntaye analam
namaskṛtya atha āśu japtvā tat dāruṇam tatyāja

21. For the welfare of his own country's armies and for peace, having saluted and then quickly chanted, he released that terrible fire (weapon).

Words meanings summery:

• आत्मीयदेशसैन्यानाम् (ātmīyadeśasainyānām) - of his own country's armies

• श्रेयोर्थम् (śreyortham) - for the sake of welfare

• शान्तये (śāntaye) - for peace, for pacification

• अनलम् (analam) - the fire weapon (fire, fire weapon)

• नमस्कृत्य (namaskṛtya) - having saluted, having bowed down

• अथ (atha) - then, thereupon, and so

• जप्त्वा (japtvā) - having chanted, having muttered

• आशु (āśu) - quickly, swiftly, immediately

• सः (saḥ) - he, that (person)

• तत् (tat) - that terrible (weapon) (that, it)

• तत्याज (tatyāja) - he released, he abandoned

• दारुणम् (dāruṇam) - the terrible (weapon) (terrible, dreadful, fierce)

Words meanings and morphology

आत्मीयदेशसैन्यानाम् (ātmīyadeśasainyānām) - of his own country's armies

(noun)

Genitive, neuter, plural of ātmīyadeśasainya

ātmīyadeśasainya - army of one's own country

Compound type : tatpuruṣa (ātmīyadeśa+sainya)

• ātmīya – one's own, personal, belonging to self
  adjective
• deśa – country, region, place
  noun (masculine)
• sainya – army, troops; belonging to an army
  noun (neuter)

श्रेयोर्थम् (śreyortham) - for the sake of welfare

(indeclinable)

Compound type : tatpuruṣa (śreyas+artha)

• śreyas – welfare, good fortune, prosperity
  noun (neuter)
• artha – purpose, aim, object, sake, meaning
  noun (masculine)

Note: Adverbial usage of accusative singular

शान्तये (śāntaye) - for peace, for pacification

(noun)

Dative, feminine, singular of śānti

śānti - peace, tranquility, cessation, pacification

Root: śam (class 4)

अनलम् (analam) - the fire weapon (fire, fire weapon)

(noun)

Accusative, masculine, singular of anala

anala - fire, god of fire

नमस्कृत्य (namaskṛtya) - having saluted, having bowed down

(indeclinable)

absolutive

Derived from root kṛ (to do) with namas (salutation) and suffix -tya

Root: kṛ (class 8)

अथ (atha) - then, thereupon, and so

(indeclinable)

जप्त्वा (japtvā) - having chanted, having muttered

(indeclinable)

absolutive

Derived from root jap (to murmur) with suffix -tvā

Root: jap (class 1)

आशु (āśu) - quickly, swiftly, immediately

(indeclinable)

सः (saḥ) - he, that (person)

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

तत् (tat) - that terrible (weapon) (that, it)

(pronoun)

Accusative, neuter, singular of tad

tad - that, he, she, it

तत्याज (tatyāja) - he released, he abandoned

(verb)

3rd person , singular, active, perfect (lit) of tyaj

perfect active

Perfect tense, third person singular, active voice

Root: tyaj (class 1)

दारुणम् (dāruṇam) - the terrible (weapon) (terrible, dreadful, fierce)

(adjective)

Accusative, neuter, singular of dāruṇa

dāruṇa - terrible, dreadful, formidable, harsh

Note: Modifies an implied noun like 'astra' (weapon).