महाभारतः mahābhārataḥ - book-6, chapter-77, verse-21

मण्डलं तु समालोक्य व्यूहं परमदारुणम् ।
स्वयं युधिष्ठिरो राजा व्यूहं वज्रमथाकरोत् ॥२१॥

21. maṇḍalaṁ tu samālokya vyūhaṁ paramadāruṇam ,
svayaṁ yudhiṣṭhiro rājā vyūhaṁ vajramathākarot.

21. maṇḍalam tu samālokya vyūham paramadāruṇam svayam
yudhiṣṭhiraḥ rājā vyūham vajram atha akarot

21. युधिष्ठिरः राजा स्वयं परमदारुणम् मण्डलम
व्यूहम समालोक्य अथ वज्रम व्यूहम अकरोत्

21. Having observed the exceedingly dreadful circular battle array, King Yudhishthira himself then formed the thunderbolt array.

Words meanings summery:

• मण्डलम् (maṇḍalam) - circular battle array (circle, disc, orb, territory, region, circular formation)

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

• समालोक्य (samālokya) - having observed (having seen, having observed, having perceived)

• व्यूहम् (vyūham) - battle array (formation, array, battle array, arrangement)

• परमदारुणम् (paramadāruṇam) - exceedingly dreadful (exceedingly dreadful, extremely terrible)

• स्वयम् (svayam) - himself (oneself, personally, by oneself, spontaneously)

• युधिष्ठिरः (yudhiṣṭhiraḥ) - Yudhishthira (Yudhishthira (proper name))

• राजा (rājā) - king (king, sovereign)

• व्यूहम् (vyūham) - battle array (formation, array, battle array, arrangement)

• वज्रम् (vajram) - thunderbolt formation (thunderbolt, diamond, a weapon, a specific battle formation)

• अथ (atha) - then (then, now, thereupon, moreover)

• अकरोत् (akarot) - he formed (he made, he did, he formed)

Words meanings and morphology

मण्डलम् (maṇḍalam) - circular battle array (circle, disc, orb, territory, region, circular formation)

(noun)

Accusative, neuter, singular of maṇḍala

maṇḍala - circle, disc, orb, territory, region, circular formation

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

(indeclinable)

समालोक्य (samālokya) - having observed (having seen, having observed, having perceived)

(indeclinable)

absolutive

Formed from prefixes sam- + ā- + root lok (to see) + suffix -ya

Prefixes: sam+ā

Root: lok (class 1)

व्यूहम् (vyūham) - battle array (formation, array, battle array, arrangement)

(noun)

Accusative, masculine, singular of vyūha

vyūha - formation, array, battle array, arrangement

परमदारुणम् (paramadāruṇam) - exceedingly dreadful (exceedingly dreadful, extremely terrible)

(adjective)

Accusative, masculine, singular of paramadāruṇa

paramadāruṇa - exceedingly dreadful, extremely terrible

Compound type : karmadhāraya (parama+dāruṇa)

• parama – highest, supreme, excellent, exceedingly
  adjective
• dāruṇa – dreadful, terrible, severe, harsh
  adjective

स्वयम् (svayam) - himself (oneself, personally, by oneself, spontaneously)

(indeclinable)

युधिष्ठिरः (yudhiṣṭhiraḥ) - Yudhishthira (Yudhishthira (proper name))

(proper noun)

Nominative, masculine, singular of yudhiṣṭhira

yudhiṣṭhira - Yudhishthira (firm in battle, proper name)

Compound type : aluk-tatpurusha (yudhi+sthira)

• yudh – battle, fight, war
  noun (feminine)
• sthira – firm, steady, constant
  adjective
  Root: sthā (class 1)

राजा (rājā) - king (king, sovereign)

(noun)

Nominative, masculine, singular of rājan

rājan - king, sovereign

Root: rāj (class 1)

व्यूहम् (vyūham) - battle array (formation, array, battle array, arrangement)

(noun)

Accusative, masculine, singular of vyūha

vyūha - formation, array, battle array, arrangement

वज्रम् (vajram) - thunderbolt formation (thunderbolt, diamond, a weapon, a specific battle formation)

(noun)

Accusative, neuter, singular of vajra

vajra - thunderbolt, diamond, weapon, battle formation

From root vaj (to be strong, to go).

Root: vaj (class 1)

Note: Often described as a very strong and penetrative formation.

अथ (atha) - then (then, now, thereupon, moreover)

(indeclinable)

अकरोत् (akarot) - he formed (he made, he did, he formed)

(verb)

3rd person , singular, active, aorist (luṅ) of kṛ

aorist

Imperfect, 3rd person singular, active voice. Root kṛ class 8.

Root: kṛ (class 8)

Note: The a- prefix is augment for past tense.