महाभारतः mahābhārataḥ - book-8, chapter-32, verse-17

कोसलैः काशिमत्स्यैश्च कारूषैः केकयैरपि ।
शूरसेनैः शूरवीरैर्युयुधुर्युद्धदुर्मदाः ॥१७॥

17. kosalaiḥ kāśimatsyaiśca kārūṣaiḥ kekayairapi ,
śūrasenaiḥ śūravīrairyuyudhuryuddhadurmadāḥ.

17. kosalaiḥ kāśimatsyaiḥ ca kārūṣaiḥ kekayaiḥ api
śūrasenaiḥ śūravīraiḥ yuyudhuḥ yuddhadurmadāḥ

17. yuddhadurmadāḥ kosalaiḥ kāśimatsyaiḥ ca kārūṣaiḥ
kekayaiḥ api śūrasenaiḥ śūravīraiḥ yuyudhuḥ

17. They, intoxicated with battle, fought alongside the Kosalas, the Kaśis and Matsyas, the Karūṣas, the Kekayas, and also the Śūrasenas, who were all brave heroes.

Words meanings summery:

• कोसलैः (kosalaiḥ) - by the warriors from the Kosala kingdom (by the Kosalas (people from Kosala kingdom))

• काशिमत्स्यैः (kāśimatsyaiḥ) - by the warriors from the Kaśi and Matsya kingdoms (by the Kaśis and Matsyas)

• च (ca) - and (and; also)

• कारूषैः (kārūṣaiḥ) - by the warriors from the Karūṣa kingdom (by the Karūṣas (people from Karūṣa kingdom))

• केकयैः (kekayaiḥ) - by the warriors from the Kekaya kingdom (by the Kekayas (people from Kekaya kingdom))

• अपि (api) - also (also, even, too)

• शूरसेनैः (śūrasenaiḥ) - by the warriors from the Śūrasena kingdom (by the Śūrasenas (people from Śūrasena kingdom))

• शूरवीरैः (śūravīraiḥ) - by brave heroes (by brave heroes, by valiant warriors)

• युयुधुः (yuyudhuḥ) - they fought

• युद्धदुर्मदाः (yuddhadurmadāḥ) - those who were intoxicated with battle fury (battle-intoxicated, battle-mad)

Words meanings and morphology

कोसलैः (kosalaiḥ) - by the warriors from the Kosala kingdom (by the Kosalas (people from Kosala kingdom))

(proper noun)

Instrumental, masculine, plural of kosala

kosala - name of a country and its people (Kosala)

Note: Indicates who they fought with.

काशिमत्स्यैः (kāśimatsyaiḥ) - by the warriors from the Kaśi and Matsya kingdoms (by the Kaśis and Matsyas)

(proper noun)

Instrumental, masculine, plural of kāśimatsya

kāśimatsya - people of Kaśi and Matsya

Compound type : dvandva (kāśi+matsya)

• kāśi – name of a country (Varanasi region) and its people
  proper noun (masculine)
• matsya – name of a country and its people, fish
  proper noun (masculine)

Note: Indicates who they fought with.

च (ca) - and (and; also)

(indeclinable)

कारूषैः (kārūṣaiḥ) - by the warriors from the Karūṣa kingdom (by the Karūṣas (people from Karūṣa kingdom))

(proper noun)

Instrumental, masculine, plural of kārūṣa

kārūṣa - name of a country and its people (Karūṣa)

Note: Indicates who they fought with.

केकयैः (kekayaiḥ) - by the warriors from the Kekaya kingdom (by the Kekayas (people from Kekaya kingdom))

(proper noun)

Instrumental, masculine, plural of kekaya

kekaya - name of a country and its people (Kekaya)

Note: Indicates who they fought with.

अपि (api) - also (also, even, too)

(indeclinable)

शूरसेनैः (śūrasenaiḥ) - by the warriors from the Śūrasena kingdom (by the Śūrasenas (people from Śūrasena kingdom))

(proper noun)

Instrumental, masculine, plural of śūrasena

śūrasena - name of a country and its people (Śūrasena), usually Mathura region

Note: Indicates who they fought with.

शूरवीरैः (śūravīraiḥ) - by brave heroes (by brave heroes, by valiant warriors)

(noun)

Instrumental, masculine, plural of śūravīra

śūravīra - brave hero, valiant warrior

Compound type : karmadhāraya (śūra+vīra)

• śūra – brave, valorous, hero
  adjective (masculine)
• vīra – hero, warrior, brave
  noun (masculine)

Note: Qualifies the preceding groups or adds another category of fighters.

युयुधुः (yuyudhuḥ) - they fought

(verb)

3rd person , plural, active, perfect (lit) of yudh

Perfect Tense (Reduplicated Perfect)

3rd person plural perfect active.

Root: yudh (class 4)

Note: The verb for the fighting.

युद्धदुर्मदाः (yuddhadurmadāḥ) - those who were intoxicated with battle fury (battle-intoxicated, battle-mad)

(adjective)

Nominative, masculine, plural of yuddhadurmada

yuddhadurmada - intoxicated with battle, battle-mad, fiercely arrogant in war

Compound type : tatpuruṣa (yuddha+durmada)

• yuddha – battle, fight, war
  noun (neuter)
  Past Passive Participle (from yudh) used as a noun
  From root yudh (to fight) with suffix -ta.
  Root: yudh (class 4)
• durmada – mad with pride, intoxicated, fierce
  adjective (masculine)
  From dur (bad, difficult) and mada (intoxication, pride).
  Prefix: dur

Note: Qualifies the unspecified fighters (whoever is implied by yuyudhuḥ).