महाभारतः mahābhārataḥ - book-7, chapter-170, verse-58

विवर्धमानमालक्ष्य तदस्त्रं भीमविक्रमम् ।
पाण्डुसैन्यमृते भीमं सुमहद्भयमाविशत् ॥५८॥

58. vivardhamānamālakṣya tadastraṁ bhīmavikramam ,
pāṇḍusainyamṛte bhīmaṁ sumahadbhayamāviśat.

58. vivardhamānam ālakṣya tat astraṃ bhīmavikramam
pāṇḍusainyam ṛte bhīmam sumahat bhayam āviśat

58. vivardhamānam bhīmavikramam tat astraṃ ālakṣya,
bhīmam ṛte pāṇḍusainyam sumahat bhayam āviśat

58. Having seen that weapon (astra) of terrible prowess continuously growing, great fear entered the Pāṇḍava army, except for Bhīma.

Words meanings summery:

• विवर्धमानम् (vivardhamānam) - (that weapon) which was progressively growing in power (increasing, growing, intensifying)

• आलक्ष्य (ālakṣya) - having perceived, having seen, having observed

• तत् (tat) - That (specific) weapon (astra) (that, that one)

• अस्त्रं (astraṁ) - The divine or magical weapon (astra) used by Aśvatthāman (weapon, missile, magical weapon)

• भीमविक्रमम् (bhīmavikramam) - (that weapon) which possessed fearsome power (of terrible prowess, of mighty valor)

• पाण्डुसैन्यम् (pāṇḍusainyam) - The military forces fighting for the Pāṇḍavas (the Pāṇḍava army)

• ऋते (ṛte) - except, without, apart from

• भीमम् (bhīmam) - Bhīmasena, one of the Pāṇḍava brothers (Bhīma)

• सुमहत् (sumahat) - very great, very mighty, immense

• भयम् (bhayam) - fear, dread, terror

• आविशत् (āviśat) - (fear) seized or overcame (entered, possessed, pervaded)

Words meanings and morphology

विवर्धमानम् (vivardhamānam) - (that weapon) which was progressively growing in power (increasing, growing, intensifying)

(participle)

Accusative, neuter, singular of vivardhamāna

vivardhamāna - growing, increasing, developing, intensifying

Present Middle Participle

From root 'vṛdh' (to grow) with prefix 'vi' and 'śānac' (present middle participle suffix).

Prefix: vi

Root: vṛdh (class 1)

आलक्ष्य (ālakṣya) - having perceived, having seen, having observed

(indeclinable)

Absolutive (Gerund)

From root 'lakṣ' (to see, perceive) with prefix 'ā' and 'lyap' (absolutive suffix).

Prefix: ā

Root: lakṣ (class 10)

तत् (tat) - That (specific) weapon (astra) (that, that one)

(pronoun)

Accusative, neuter, singular of tad

tad - that, it

अस्त्रं (astraṁ) - The divine or magical weapon (astra) used by Aśvatthāman (weapon, missile, magical weapon)

(noun)

Accusative, neuter, singular of astra

astra - weapon, missile, dart (often divine or magical)

From root 'as' (to throw) + 'tra' (instrumental suffix).

Root: as (class 4)

भीमविक्रमम् (bhīmavikramam) - (that weapon) which possessed fearsome power (of terrible prowess, of mighty valor)

(adjective)

Accusative, neuter, singular of bhīmavikrama

bhīmavikrama - of terrible prowess, of mighty valor, terrible in attack

Bahuvrīhi compound 'bhīma' (terrible) + 'vikrama' (prowess, valor).

Compound type : bahuvrīhi (bhīma+vikrama)

• bhīma – terrible, fearful, formidable
  adjective (masculine)
  From root 'bhī' (to fear) + 'ma' suffix
  Root: bhī (class 3)
• vikrama – prowess, valor, heroism, step, power
  noun (masculine)
  From root 'kram' (to step) with prefix 'vi'
  Prefix: vi
  Root: kram (class 1)

Note: Qualifies 'astraṃ'.

पाण्डुसैन्यम् (pāṇḍusainyam) - The military forces fighting for the Pāṇḍavas (the Pāṇḍava army)

(noun)

Nominative, neuter, singular of pāṇḍusainya

pāṇḍusainya - the Pāṇḍava army, the army of Pāṇḍu's sons

Tatpuruṣa compound 'pāṇḍu' (Pāṇḍu) + 'sainya' (army).

Compound type : tatpuruṣa (pāṇḍu+sainya)

• pāṇḍu – Pāṇḍu (name of a king, father of Pāṇḍavas), pale, yellowish-white
  proper noun (masculine)
• sainya – army, host, military forces
  noun (neuter)
  Derived from 'senā' (army) with 'ya' affix.

Note: Subject of 'āviśat' (along with 'bhayam').

ऋते (ṛte) - except, without, apart from

(indeclinable)

Requires accusative case (bhīmam).

भीमम् (bhīmam) - Bhīmasena, one of the Pāṇḍava brothers (Bhīma)

(proper noun)

Accusative, masculine, singular of bhīma

bhīma - Bhīma (name of a Pāṇḍava), terrible, formidable

From root 'bhī' (to fear) + 'ma' suffix.

Root: bhī (class 3)

सुमहत् (sumahat) - very great, very mighty, immense

(adjective)

Nominative, neuter, singular of sumahat

sumahat - very great, exceedingly large, immense

Compound 'su' (good, very) + 'mahat' (great).

Compound type : avyayībhāva (su+mahat)

• su – good, well, excellent, very, easily
  indeclinable
• mahat – great, large, mighty, important
  adjective (neuter)

Note: Qualifies 'bhayam'.

भयम् (bhayam) - fear, dread, terror

(noun)

Nominative, neuter, singular of bhaya

bhaya - fear, dread, terror, danger

From root 'bhī' (to fear) + 'a' affix.

Root: bhī (class 3)

आविशत् (āviśat) - (fear) seized or overcame (entered, possessed, pervaded)

(verb)

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

Imperfect Active

3rd person singular, Imperfect Tense, Parasmaipada

Prefix: ā

Root: viś (class 6)

Note: Main verb of the sentence.