महाभारतः mahābhārataḥ - book-7, chapter-60, verse-21

सैन्धवस्य वधप्रेप्सुः प्रयातः शत्रुपूगहा ।
सहाम्बुपतिमित्राभ्यां यथेन्द्रस्तारकामये ॥२१॥

21. saindhavasya vadhaprepsuḥ prayātaḥ śatrupūgahā ,
sahāmbupatimitrābhyāṁ yathendrastārakāmaye.

21. saindhavasya vadhaprepsuḥ prayātaḥ śatrupūgahā
saha ambupatimitrābhyām yathā indraḥ tārakāmaye

21. śatrupūgahā saindhavasya vadhaprepsuḥ prayātaḥ
yathā indraḥ ambupatimitrābhyām saha tārakāmaye

21. Desirous of killing Saindhava (Jayadratha), the slayer of enemy hosts (Arjuna) set forth, just as Indra, accompanied by Ambupati (Varuna) and Mitra, did for the war with Taraka.

Words meanings summery:

• सैन्धवस्य (saindhavasya) - of Jayadratha (of Saindhava, of Jayadratha (king of Sindhu))

• वधप्रेप्सुः (vadhaprepsuḥ) - desirous of killing, wishing to strike

• प्रयातः (prayātaḥ) - proceeded, set forth, departed

• शत्रुपूगहा (śatrupūgahā) - slayer of hosts of enemies

• सह (saha) - with, together with

• अम्बुपतिमित्राभ्याम् (ambupatimitrābhyām) - with Ambupati (Varuna) and Mitra

• यथा (yathā) - as, just as, according to

• इन्द्रः (indraḥ) - Indra (king of gods)

• तारकामये (tārakāmaye) - for the war with Taraka (in the war with Taraka, for the purpose of Taraka)

Words meanings and morphology

सैन्धवस्य (saindhavasya) - of Jayadratha (of Saindhava, of Jayadratha (king of Sindhu))

(proper noun)

Genitive, masculine, singular of saindhava

saindhava - native of Sindhu (region), Jayadratha (king of Sindhu)

derivative of Sindhu

वधप्रेप्सुः (vadhaprepsuḥ) - desirous of killing, wishing to strike

(adjective)

Nominative, masculine, singular of vadhaprepsu

vadhaprepsu - desirous of killing, wishing to strike

Compound type : tatpurusha (vadha+īpsu)

• vadha – killing, slaughter
  noun (masculine)
  from root han
  Root: han (class 2)
• īpsu – desirous of, wishing to obtain
  adjective (masculine)
  desiderative agent noun
  from root āp with desiderative suffix san + u
  Root: āp (class 5)

Note: Acts as an epithet for Arjuna.

प्रयातः (prayātaḥ) - proceeded, set forth, departed

(adjective)

Nominative, masculine, singular of prayāta

prayāta - gone forth, departed, proceeded

past passive participle

from root yā (to go) with prefix pra

Prefix: pra

Root: yā (class 2)

Note: Used adjectivally, indicating action by the nominative subject.

शत्रुपूगहा (śatrupūgahā) - slayer of hosts of enemies

(adjective)

Nominative, masculine, singular of śatrupūgaha

śatrupūgaha - slayer of hosts of enemies

Compound type : tatpurusha (śatrupūga+hā)

• śatrupūga – host of enemies
  noun (masculine)
• hā – killer, destroyer
  noun (masculine)
  from root han
  Root: han (class 2)

Note: Acts as an epithet for Arjuna.

सह (saha) - with, together with

(indeclinable)

Note: Usually takes instrumental.

अम्बुपतिमित्राभ्याम् (ambupatimitrābhyām) - with Ambupati (Varuna) and Mitra

(noun)

Instrumental, masculine, dual of ambupatimitra

ambupatimitra - Ambupati (Varuna) and Mitra

Compound type : dvandva (ambupati+mitra)

• ambupati – lord of waters, Varuna
  proper noun (masculine)
• mitra – Mitra (Vedic deity), friend
  proper noun (masculine)

यथा (yathā) - as, just as, according to

(indeclinable)

इन्द्रः (indraḥ) - Indra (king of gods)

(proper noun)

Nominative, masculine, singular of indra

indra - Indra (name of the king of gods)

तारकामये (tārakāmaye) - for the war with Taraka (in the war with Taraka, for the purpose of Taraka)

(noun)

Locative, masculine, singular of tārakāmaya

tārakāmaya - related to Taraka, war with Taraka (demon)

Compound type : tatpurusha (tāraka+āmaya)

• tāraka – Taraka (a demon)
  proper noun (masculine)
• āmaya – sickness, disease, calamity, distress
  noun (masculine)
  Prefix: ā

Note: Locative case here expresses 'for the purpose of' or 'during the event of'.