महाभारतः mahābhārataḥ - book-14, chapter-84, verse-14

तमुन्मथ्य हयश्रेष्ठं यादवानां कुमारकाः ।
प्रययुस्तांस्तदा राजन्नुग्रसेनो न्यवारयत् ॥१४॥

14. tamunmathya hayaśreṣṭhaṁ yādavānāṁ kumārakāḥ ,
prayayustāṁstadā rājannugraseno nyavārayat.

14. tam unmathya hayaśreṣṭham yādavānām kumārakāḥ
prayayuḥ tān tadā rājan ugrasenaḥ nyavārayat

14. rājan tadā yādavānām kumārakāḥ tam hayaśreṣṭham
unmathya tān prayayuḥ ugrasenaḥ nyavārayat

14. O king, having seized that excellent horse, the young Yadava princes were about to rush forth (to fight), but then Ugrasena restrained them.

Words meanings summery:

• तम् (tam) - that (horse) (him, that)

• उन्मथ्य (unmathya) - having seized (having agitated, having seized, having disturbed)

• हयश्रेष्ठम् (hayaśreṣṭham) - the best of horses, excellent horse

• यादवानाम् (yādavānām) - of the Yadavas

• कुमारकाः (kumārakāḥ) - young Yadava princes (young boys, princes)

• प्रययुः (prayayuḥ) - they were about to rush forth (to fight) (they went forth, they rushed)

• तान् (tān) - them (the Yadava princes) (those, them)

• तदा (tadā) - then, at that time

• राजन् (rājan) - O king

• उग्रसेनः (ugrasenaḥ) - Ugrasena (proper name)

• न्यवारयत् (nyavārayat) - he prevented, he restrained

Words meanings and morphology

तम् (tam) - that (horse) (him, that)

(pronoun)

Accusative, masculine, singular of tad

tad - that, he, she, it

Note: Refers to hayaśreṣṭham

उन्मथ्य (unmathya) - having seized (having agitated, having seized, having disturbed)

(indeclinable)

Absolutive (Gerund)

From root math with upasarga ut-

Prefix: ut

Root: math (class 1)

हयश्रेष्ठम् (hayaśreṣṭham) - the best of horses, excellent horse

(noun)

Accusative, masculine, singular of hayaśreṣṭha

hayaśreṣṭha - best of horses

Compound type : tatpuruṣa (haya+śreṣṭha)

• haya – horse, steed
  noun (masculine)
• śreṣṭha – best, most excellent
  adjective (masculine)
  Superlative of praśasya (excellent)

Note: Object of unmathya

यादवानाम् (yādavānām) - of the Yadavas

(noun)

Genitive, masculine, plural of yādava

yādava - descendant of Yadu, a member of the Yadava clan

Note: Possessive with kumārakāḥ

कुमारकाः (kumārakāḥ) - young Yadava princes (young boys, princes)

(noun)

Nominative, masculine, plural of kumāraka

kumāraka - young boy, youth, prince

Diminutive or derived from kumāra

Note: Subject of prayayuḥ

प्रययुः (prayayuḥ) - they were about to rush forth (to fight) (they went forth, they rushed)

(verb)

3rd person , plural, active, past perfect (lit) of prayā

Perfect

From root yā with upasarga pra-

Prefix: pra

Root: yā (class 2)

तान् (tān) - them (the Yadava princes) (those, them)

(pronoun)

Accusative, masculine, plural of tad

tad - that, he, she, it

Note: Object of nyavārayat, referring to the Yadava princes

तदा (tadā) - then, at that time

(indeclinable)

Suffix -dā added to pronoun tad

राजन् (rājan) - O king

(noun)

Vocative, masculine, singular of rājan

rājan - king, ruler

Note: Address to the listener/narratee

उग्रसेनः (ugrasenaḥ) - Ugrasena (proper name)

(proper noun)

Nominative, masculine, singular of ugrasena

ugrasena - Ugrasena (name of a king of Mathurā)

Note: Subject of nyavārayat

न्यवारयत् (nyavārayat) - he prevented, he restrained

(verb)

3rd person , singular, active, past imperfect (laṅ) of nivāray

Imperfect

Causative of root vṛ with upasarga ni-

Prefix: ni

Root: vṛ (class 5)