महाभारतः mahābhārataḥ - book-9, chapter-13, verse-11

ते वध्यमानाः समरे पार्थनामाङ्कितैः शरैः ।
पार्थभूतममन्यन्त प्रेक्षमाणास्तथाविधम् ॥११॥

11. te vadhyamānāḥ samare pārthanāmāṅkitaiḥ śaraiḥ ,
pārthabhūtamamanyanta prekṣamāṇāstathāvidham.

11. te vadhyamānāḥ samare pārthanāmāṅkitaiḥ śaraiḥ
pārthabhūtam amanyanta prekṣamāṇāḥ tathāvidham

11. samare pārthanāmāṅkitaiḥ śaraiḥ vadhyamānāḥ te
tathāvidham prekṣamāṇāḥ pārthabhūtam amanyanta

11. As they were being struck down in battle by arrows marked with Pārtha's name, and witnessing him in such a form, they believed him to be Pārtha (Arjuna) himself.

Words meanings summery:

• ते (te) - they

• वध्यमानाः (vadhyamānāḥ) - being killed, being struck down

• समरे (samare) - in battle, in war

• पार्थनामाङ्कितैः (pārthanāmāṅkitaiḥ) - by arrows marked with Arjuna's name (by those marked with Pārtha's name)

• शरैः (śaraiḥ) - by arrows

• पार्थभूतम् (pārthabhūtam) - having become Pārtha, Pārtha himself

• अमन्यन्त (amanyanta) - they considered, they thought

• प्रेक्षमाणाः (prekṣamāṇāḥ) - seeing, observing

• तथाविधम् (tathāvidham) - witnessing him in such a form/state (such, of that kind, in that manner)

Words meanings and morphology

ते (te) - they

(pronoun)

Nominative, masculine, plural of tad

tad - that, he, she, it

वध्यमानाः (vadhyamānāḥ) - being killed, being struck down

(adjective)

Nominative, masculine, plural of vadhyamāna

vadhyamāna - being killed, being struck, being slain

Present Passive Participle

From causative of root han- 'to strike, kill'

Root: han (class 2)

समरे (samare) - in battle, in war

(noun)

Locative, masculine, singular of samara

samara - battle, conflict, war

पार्थनामाङ्कितैः (pārthanāmāṅkitaiḥ) - by arrows marked with Arjuna's name (by those marked with Pārtha's name)

(adjective)

Instrumental, masculine, plural of pārthanāmāṅkita

pārthanāmāṅkita - marked with Pārtha's name

Compound type : tatpuruṣa (pārtha+nāma+aṅkita)

• pārtha – son of Pṛthā (Arjuna), king
  proper noun (masculine)
• nāma – name, appellation
  noun (neuter)
• aṅkita – marked, designated, inscribed
  adjective (masculine)
  Past Passive Participle
  From root aṅk- 'to mark'
  Root: aṅk (class 1)

शरैः (śaraiḥ) - by arrows

(noun)

Instrumental, masculine, plural of śara

śara - arrow, reed

पार्थभूतम् (pārthabhūtam) - having become Pārtha, Pārtha himself

(adjective)

Accusative, masculine, singular of pārthabhūta

pārthabhūta - having become Pārtha, being Pārtha

Compound type : tatpuruṣa (pārtha+bhūta)

• pārtha – son of Pṛthā (Arjuna)
  proper noun (masculine)
• bhūta – become, happened, existing, being
  adjective (masculine)
  Past Passive Participle
  From root bhū- 'to be, become'
  Root: bhū (class 1)

अमन्यन्त (amanyanta) - they considered, they thought

(verb)

3rd person , plural, middle, imperfect (laṅ) of man

Imperfect tense of root man-

Root: man (class 4)

प्रेक्षमाणाः (prekṣamāṇāḥ) - seeing, observing

(adjective)

Nominative, masculine, plural of prekṣamāṇa

prekṣamāṇa - seeing, beholding, observing

Present Middle Participle

From root īkṣ- 'to see' with prefix pra-

Prefix: pra

Root: īkṣ (class 1)

तथाविधम् (tathāvidham) - witnessing him in such a form/state (such, of that kind, in that manner)

(adjective)

Accusative, masculine, singular of tathāvidha

tathāvidha - such, of that kind, in that manner