महाभारतः mahābhārataḥ - book-14, chapter-65, verse-19

धर्मपुत्रं च भीमं च फल्गुनं नकुलं तथा ।
सहदेवं च दुर्धर्ष सर्वान्नस्त्रातुमर्हसि ॥१९॥

19. dharmaputraṁ ca bhīmaṁ ca phalgunaṁ nakulaṁ tathā ,
sahadevaṁ ca durdharṣa sarvānnastrātumarhasi.

19. dharmaputram ca bhīmam ca phalgunam nakulam tathā
sahadevam ca durdharṣa sarvān naḥ trātum arhasi

19. durdharṣa dharmaputram ca bhīmam ca phalgunam
nakulam tathā sahadevam ca sarvān naḥ trātum arhasi

19. O unconquerable one, you ought to protect all of us: Yudhishthira (the son of dharma), Bhima, Arjuna, Nakula, and Sahadeva.

Words meanings summery:

• धर्मपुत्रम् (dharmaputram) - Yudhishthira, the eldest of the Pandavas (son of dharma, Yudhishthira)

• च (ca) - and (and, also)

• भीमम् (bhīmam) - Bhima, the second Pandava brother (Bhima)

• च (ca) - and (and, also)

• फल्गुनम् (phalgunam) - Arjuna, the third Pandava brother (Arjuna)

• नकुलम् (nakulam) - Nakula, one of the younger Pandava brothers (Nakula)

• तथा (tathā) - and, also (so, thus, also, and)

• सहदेवम् (sahadevam) - Sahadeva, one of the younger Pandava brothers (Sahadeva)

• च (ca) - and (and, also)

• दुर्धर्ष (durdharṣa) - O unconquerable one (vocative, addressing Krishna) (O unconquerable, O invincible)

• सर्वान् (sarvān) - all of them (all, everyone)

• नः (naḥ) - us (us, to us, our)

• त्रातुम् (trātum) - to protect (to protect, to save)

• अर्हसि (arhasi) - you ought (to protect) (you ought, you deserve, you are able)

Words meanings and morphology

धर्मपुत्रम् (dharmaputram) - Yudhishthira, the eldest of the Pandavas (son of dharma, Yudhishthira)

(noun)

Accusative, masculine, singular of dharmaputra

dharmaputra - son of dharma, son of justice, Yudhishthira

Compound type : tatpurusha (dharma+putra)

• dharma – natural law, constitution, intrinsic nature, righteousness, duty, virtue
  noun (masculine)
  Root: dhṛ
• putra – son, child
  noun (masculine)

च (ca) - and (and, also)

(indeclinable)

भीमम् (bhīmam) - Bhima, the second Pandava brother (Bhima)

(proper noun)

Accusative, masculine, singular of bhīma

bhīma - fearful, terrible, Bhima (name of a Pandava)

Root: bhī (class 3)

च (ca) - and (and, also)

(indeclinable)

फल्गुनम् (phalgunam) - Arjuna, the third Pandava brother (Arjuna)

(proper noun)

Accusative, masculine, singular of phalguna

phalguna - a type of tree, the month Phalguna, Arjuna

नकुलम् (nakulam) - Nakula, one of the younger Pandava brothers (Nakula)

(proper noun)

Accusative, masculine, singular of nakula

nakula - mongoose, Nakula (name of a Pandava)

तथा (tathā) - and, also (so, thus, also, and)

(indeclinable)

सहदेवम् (sahadevam) - Sahadeva, one of the younger Pandava brothers (Sahadeva)

(proper noun)

Accusative, masculine, singular of sahadeva

sahadeva - with a deity, Sahadeva (name of a Pandava)

च (ca) - and (and, also)

(indeclinable)

दुर्धर्ष (durdharṣa) - O unconquerable one (vocative, addressing Krishna) (O unconquerable, O invincible)

(adjective)

Vocative, masculine, singular of durdharṣa

durdharṣa - unconquerable, invincible, unassailable, formidable

Compound type : pradi-tatpurusha (dur+dharṣa)

• dur – bad, difficult, hard
  indeclinable
  Prefix indicating difficulty or badness.
• dharṣa – daring, assailing, to be assailed, boldness
  noun (masculine)
  From root dhṛṣ (to be bold, to dare).
  Root: dhṛṣ (class 5)

सर्वान् (sarvān) - all of them (all, everyone)

(pronoun)

Accusative, masculine, plural of sarva

sarva - all, every, whole, complete

नः (naḥ) - us (us, to us, our)

(pronoun)

Accusative, plural of asmad

asmad - I, we

Note: Enclitic form of the first person plural pronoun.

त्रातुम् (trātum) - to protect (to protect, to save)

(verb)

active, infinitive (tumun) of trā

infinitive

Formed from root trā (P. 2nd class) with suffix -tum.

Root: trā (class 2)

अर्हसि (arhasi) - you ought (to protect) (you ought, you deserve, you are able)

(verb)

2nd person , singular, active, present (laṭ) of arh

Present active indicative

2nd person singular, present indicative, active voice.

Root: arh (class 10)