महाभारतः mahābhārataḥ - book-5, chapter-194, verse-3

भीमार्जुनप्रभृतिभिर्महेष्वासैर्महाबलैः ।
लोकपालोपमैर्गुप्तं धृष्टद्युम्नपुरोगमैः ॥३॥

3. bhīmārjunaprabhṛtibhirmaheṣvāsairmahābalaiḥ ,
lokapālopamairguptaṁ dhṛṣṭadyumnapurogamaiḥ.

3. bhīma-arjuna-prabhṛtibhiḥ mahā-iṣvāsaiḥ mahā-balaiḥ
| lokapāla-upamaiḥ guptam dhṛṣṭadyumna-purogamaiḥ

3. bhīma-arjuna-prabhṛtibhiḥ mahā-iṣvāsaiḥ mahā-balaiḥ
lokapāla-upamaiḥ dhṛṣṭadyumna-purogamaiḥ guptam

3. Guarded by Bhima, Arjuna, and other mighty warriors who are great archers, resembling the world's protectors, and led by Dhṛṣṭadyumna.

Words meanings summery:

• भीम-अर्जुन-प्रभृतिभिः (bhīma-arjuna-prabhṛtibhiḥ) - by Bhima, Arjuna, and the other leaders of the Pāṇḍava army (by Bhima, Arjuna and others)

• महा-इष्वासैः (mahā-iṣvāsaiḥ) - by the great archers (like Bhima, Arjuna) (by great archers, by great bowmen)

• महा-बलैः (mahā-balaiḥ) - by those who are mighty (like Bhima, Arjuna) (by mighty ones, by great powerful ones)

• लोकपाल-उपमैः (lokapāla-upamaiḥ) - by warriors who are like the protectors of the world (by those who resemble the guardians of the world)

• गुप्तम् (guptam) - the army (neuter nominative singular) is protected/guarded (protected, guarded, hidden)

• धृष्टद्युम्न-पुरोगमैः (dhṛṣṭadyumna-purogamaiḥ) - by the warriors led by Dhṛṣṭadyumna (by those having Dhṛṣṭadyumna as their leader)

Words meanings and morphology

भीम-अर्जुन-प्रभृतिभिः (bhīma-arjuna-prabhṛtibhiḥ) - by Bhima, Arjuna, and the other leaders of the Pāṇḍava army (by Bhima, Arjuna and others)

(noun)

Instrumental, masculine, plural of bhīma-arjuna-prabhṛti

bhīma-arjuna-prabhṛti - Bhima, Arjuna and others/etc.

Compound type : tatpuruṣa (bhīma+arjuna+prabhṛti)

• bhīma – Bhima (name of one of the Pāṇḍavas); terrible, formidable
  proper noun (masculine)
• arjuna – Arjuna (name of one of the Pāṇḍavas); white, silver
  proper noun (masculine)
• prabhṛti – beginning, source, and so on, etcetera
  noun (feminine)
  From pra + bhṛ 'to bear, to carry'
  Prefix: pra
  Root: bhṛ (class 1)

Note: Indicates agency for 'guptam'.

महा-इष्वासैः (mahā-iṣvāsaiḥ) - by the great archers (like Bhima, Arjuna) (by great archers, by great bowmen)

(noun)

Instrumental, masculine, plural of mahā-iṣvāsa

mahā-iṣvāsa - great archer, great bowman

Compound type : karmadhāraya (mahā+iṣvāsa)

• mahā – great, mighty
  adjective
• iṣvāsa – archer, bowman
  noun (masculine)
  Derived from iṣu 'arrow' and ās 'to sit, to throw'

Note: Qualifies the fighters mentioned, and indicates agency for 'guptam'.

महा-बलैः (mahā-balaiḥ) - by those who are mighty (like Bhima, Arjuna) (by mighty ones, by great powerful ones)

(adjective)

Instrumental, masculine, plural of mahā-bala

mahā-bala - greatly powerful, mighty

Compound type : karmadhāraya (mahā+bala)

• mahā – great, mighty
  adjective
• bala – strength, power, force
  noun (neuter)

Note: Qualifies the fighters mentioned, and indicates agency for 'guptam'.

लोकपाल-उपमैः (lokapāla-upamaiḥ) - by warriors who are like the protectors of the world (by those who resemble the guardians of the world)

(adjective)

Instrumental, masculine, plural of lokapāla-upama

lokapāla-upama - resembling the guardians of the world

Compound type : tatpuruṣa (lokapāla+upama)

• lokapāla – guardian of the world, regent of a cardinal direction
  noun (masculine)
• upama – resembling, comparable, similar
  adjective (masculine)

Note: Qualifies the fighters mentioned, and indicates agency for 'guptam'.

गुप्तम् (guptam) - the army (neuter nominative singular) is protected/guarded (protected, guarded, hidden)

(adjective)

Nominative, neuter, singular of gupta

gupta - protected, guarded, hidden, concealed

Past Passive Participle

Past Passive Participle of root gup 'to protect, to guard'

Root: gup (class 1)

Note: Qualifies 'sainyam' (from the previous verse), acting as a predicative adjective.

धृष्टद्युम्न-पुरोगमैः (dhṛṣṭadyumna-purogamaiḥ) - by the warriors led by Dhṛṣṭadyumna (by those having Dhṛṣṭadyumna as their leader)

(adjective)

Instrumental, masculine, plural of dhṛṣṭadyumna-purogama

dhṛṣṭadyumna-purogama - led by Dhṛṣṭadyumna, having Dhṛṣṭadyumna as chief

Compound type : bahuvrīhi (dhṛṣṭadyumna+purogama)

• dhṛṣṭadyumna – Dhṛṣṭadyumna (name of Draupadī's brother, commander of Pāṇḍava army)
  proper noun (masculine)
• purogama – foremost, chief, leader, going before
  adjective (masculine)
  Compound of puras 'before' and gam 'to go'
  Root: gam (class 1)

Note: Qualifies the fighters mentioned, and indicates agency for 'guptam'.