महाभारतः mahābhārataḥ - book-7, chapter-163, verse-21

तथा द्रोणार्जुनौ चित्रमयुध्येतां महारथौ ।
आचार्यशिष्यौ राजेन्द्र कृतप्रहरणौ युधि ॥२१॥

21. tathā droṇārjunau citramayudhyetāṁ mahārathau ,
ācāryaśiṣyau rājendra kṛtapraharaṇau yudhi.

21. tathā droṇārjunau citram ayudhyetām mahārathau
ācāryaśiṣyau rājendra kṛtapraharaṇau yudhi

21. rājendra tathā ācāryaśiṣyau mahārathau
droṇārjunau kṛtapraharaṇau yudhi citram ayudhyetām

21. O king of kings (rājendra)! Thus, Drona and Arjuna, the guru (ācārya) and disciple, two great chariot-fighters (mahāratha), astonishingly fought in battle, having expertly wielded their weapons.

Words meanings summery:

• तथा (tathā) - thus, so, similarly

• द्रोणार्जुनौ (droṇārjunau) - Drona and Arjuna

• चित्रम् (citram) - wonderfully, astonishingly, variegated

• अयुध्येताम् (ayudhyetām) - they fought

• महारथौ (mahārathau) - two great chariot-fighters, two great warriors

• आचार्यशिष्यौ (ācāryaśiṣyau) - guru and disciple

• राजेन्द्र (rājendra) - O king of kings

• कृतप्रहरणौ (kṛtapraharaṇau) - having wielded weapons, having struck

• युधि (yudhi) - in battle

Words meanings and morphology

तथा (tathā) - thus, so, similarly

(indeclinable)

द्रोणार्जुनौ (droṇārjunau) - Drona and Arjuna

(proper noun)

Nominative, masculine, dual of droṇārjuna

droṇārjuna - Drona and Arjuna

Compound type : dvandva (droṇa+arjuna)

• droṇa – Drona (preceptor of the Kauravas and Pandavas), a measure of grain
  proper noun (masculine)
• arjuna – Arjuna (one of the Pandavas), white, peacock
  proper noun (masculine)

चित्रम् (citram) - wonderfully, astonishingly, variegated

(indeclinable)

अयुध्येताम् (ayudhyetām) - they fought

(verb)

3rd person , dual, middle, imperfect (laṅ) of √yudh

Imperfect tense form

Imperfect 3rd dual middle

Root: √yudh (class 4)

महारथौ (mahārathau) - two great chariot-fighters, two great warriors

(noun)

Nominative, masculine, dual of mahāratha

mahāratha - a great warrior, one who can fight ten thousand warriors from a single chariot

Compound type : karmadhāraya (mahā+ratha)

• mahā – great, large, mighty
  adjective (feminine)
• ratha – chariot, warrior (from chariot-borne warrior)
  noun (masculine)

आचार्यशिष्यौ (ācāryaśiṣyau) - guru and disciple

(noun)

Nominative, masculine, dual of ācāryaśiṣya

ācāryaśiṣya - teacher and student, guru and disciple

Compound type : dvandva (ācārya+śiṣya)

• ācārya – teacher, preceptor, guru
  noun (masculine)
  Derived from root √car (to move) with upasarga 'ā'
  Prefix: ā
  Root: √car (class 1)
• śiṣya – disciple, student, pupil
  noun (masculine)
  Gerundive/Passive Participle
  Derived from root √śās (to teach, instruct)
  Root: √śās (class 2)

राजेन्द्र (rājendra) - O king of kings

(proper noun)

Vocative, masculine, singular of rājendra

rājendra - king of kings, supreme monarch

Compound type : tatpurusha (rājan+indra)

• rājan – king, ruler
  noun (masculine)
• indra – Indra (name of a deity), chief, best
  noun (masculine)

कृतप्रहरणौ (kṛtapraharaṇau) - having wielded weapons, having struck

(adjective)

Nominative, masculine, dual of kṛtapraharaṇa

kṛtapraharaṇa - one who has wielded a weapon, one who has delivered a blow

Compound type : bahuvrihi (kṛta+praharaṇa)

• kṛta – done, made, performed
  adjective (masculine)
  Past Passive Participle
  Derived from root √kṛ (to do, make)
  Root: √kṛ (class 8)
• praharaṇa – weapon, striking, hitting
  noun (neuter)
  Action noun
  Derived from root √hṛ (to take) with upasargas 'pra'
  Prefix: pra
  Root: √hṛ (class 1)

युधि (yudhi) - in battle

(noun)

Locative, feminine, singular of yudh

yudh - battle, fight, combat, war

Root: √yudh (class 4)