महाभारतः mahābhārataḥ - book-7, chapter-129, verse-18

ततः समभवद्युद्धं संध्यायामतिदारुणम् ।
द्रोणस्य च महाराज सृञ्जयानां च सर्वशः ॥१८॥

18. tataḥ samabhavadyuddhaṁ saṁdhyāyāmatidāruṇam ,
droṇasya ca mahārāja sṛñjayānāṁ ca sarvaśaḥ.

18. tataḥ samabhavat yuddham sandhyāyām atidāruṇam
droṇasya ca mahārāja sṛñjayānām ca sarvaśaḥ

18. mahārāja tataḥ sandhyāyām atidāruṇam yuddham
droṇasya ca sṛñjayānām ca sarvaśaḥ samabhavat

18. O great king, then a most terrible battle took place at twilight, engaging Droṇa against all the Sañjayas.

Words meanings summery:

• ततः (tataḥ) - then, thereafter

• समभवत् (samabhavat) - occurred, took place, happened

• युद्धम् (yuddham) - battle, fight

• सन्ध्यायाम् (sandhyāyām) - at twilight, at dusk

• अतिदारुणम् (atidāruṇam) - exceedingly terrible, very fierce

• द्रोणस्य (droṇasya) - of Droṇa

• च (ca) - and

• महाराज (mahārāja) - O great king

• सृञ्जयानाम् (sṛñjayānām) - of the Sañjayas

• च (ca) - and

• सर्वशः (sarvaśaḥ) - entirely, completely, from all sides

Words meanings and morphology

ततः (tataḥ) - then, thereafter

(indeclinable)

समभवत् (samabhavat) - occurred, took place, happened

(verb)

3rd person , singular, active, imperfect (laṅ) of sambhū

Prefix: sam

Root: bhū (class 1)

युद्धम् (yuddham) - battle, fight

(noun)

Nominative, neuter, singular of yuddha

yuddha - battle, fight, war

Past Passive Participle (used as noun)

Derived from root yudh (to fight)

Root: yudh (class 4)

सन्ध्यायाम् (sandhyāyām) - at twilight, at dusk

(noun)

Locative, feminine, singular of sandhyā

sandhyā - twilight, dusk, evening

अतिदारुणम् (atidāruṇam) - exceedingly terrible, very fierce

(adjective)

Nominative, neuter, singular of atidāruṇa

atidāruṇa - very terrible, exceedingly fierce, extremely dreadful

Compound type : karmadhāraya (ati+dāruṇa)

• ati – over, beyond, excessively, very
  indeclinable
• dāruṇa – terrible, dreadful, harsh, fierce
  adjective (neuter)

द्रोणस्य (droṇasya) - of Droṇa

(proper noun)

Genitive, masculine, singular of droṇa

droṇa - Droṇa (a name of a warrior/guru in Mahabharata)

च (ca) - and

(indeclinable)

महाराज (mahārāja) - O great king

(noun)

Vocative, masculine, singular of mahārāja

mahārāja - great king, emperor

Compound type : karmadhāraya (mahā+rājan)

• mahā – great, mighty
  adjective
• rājan – king, ruler
  noun (masculine)

सृञ्जयानाम् (sṛñjayānām) - of the Sañjayas

(proper noun)

Genitive, masculine, plural of sṛñjaya

sṛñjaya - Sanjaya (name of a people or tribe in Mahabharata)

च (ca) - and

(indeclinable)

सर्वशः (sarvaśaḥ) - entirely, completely, from all sides

(indeclinable)

Derived from 'sarva' (all) with the suffix 'śas'.