महाभारतः mahābhārataḥ - book-2, chapter-48, verse-42

द्वौ करं न प्रयच्छेतां कुन्तीपुत्राय भारत ।
वैवाहिकेन पाञ्चालाः सख्येनान्धकवृष्णयः ॥४२॥

42. dvau karaṁ na prayacchetāṁ kuntīputrāya bhārata ,
vaivāhikena pāñcālāḥ sakhyenāndhakavṛṣṇayaḥ.

42. dvau karam na prayacchetām kuntīputrāya bhārata
vaivāhikena pāñcālāḥ sakhyena andhakavṛṣṇayaḥ

42. O descendant of Bhārata, two would not offer aid to the son of Kuntī: the Pāñcālas because of the marriage alliance, and the Andhaka-Vṛṣṇis because of friendship.

Words meanings summery:

• द्वौ (dvau) - two groups (two)

• करम् (karam) - aid or tribute (tribute, tax, hand)

• न (na) - not, no

• प्रयच्छेताम् (prayacchetām) - they two would offer (aid) (they two would give/offer)

• कुन्तीपुत्राय (kuntīputrāya) - to Yudhishthira, the son of Kunti (to the son of Kunti)

• भारत (bhārata) - O Duryodhana (O descendant of Bharata)

• वैवाहिकेन (vaivāhikena) - by the marital alliance, by marriage

• पाञ्चालाः (pāñcālāḥ) - the Panchalas

• सख्येन (sakhyena) - by friendship

• अन्धकवृष्णयः (andhakavṛṣṇayaḥ) - the Andhakas and Vrishnis

Words meanings and morphology

द्वौ (dvau) - two groups (two)

(numeral)

करम् (karam) - aid or tribute (tribute, tax, hand)

(noun)

Accusative, masculine, singular of kara

kara - hand, ray, tax, tribute, action

Root: kṛ (class 8)

Note: Object of 'prayacchetām'.

न (na) - not, no

(indeclinable)

Particle of negation.

प्रयच्छेताम् (prayacchetām) - they two would offer (aid) (they two would give/offer)

(verb)

3rd person , dual, active, optative (vidhiliṅ) of prayacch

Optative mood, parasmaipada.

Prefix: pra

Root: yam (class 1)

कुन्तीपुत्राय (kuntīputrāya) - to Yudhishthira, the son of Kunti (to the son of Kunti)

(noun)

Dative, masculine, singular of kuntīputra

kuntīputra - son of Kunti (Yudhishthira, Bhima, Arjuna)

Compound type : Tatpurusha (kuntī+putra)

• kuntī – Kunti (proper name), mother of the Pandavas
  proper noun (feminine)
• putra – son
  noun (masculine)

भारत (bhārata) - O Duryodhana (O descendant of Bharata)

(proper noun)

Vocative, masculine, singular of bhārata

bhārata - descendant of Bharata, an Indian, a warrior

Patronymic.

Root: bhṛ (class 1)

वैवाहिकेन (vaivāhikena) - by the marital alliance, by marriage

(noun)

Instrumental, neuter, singular of vaivāhika

vaivāhika - relating to marriage, matrimonial

Derived from 'vivāha' (marriage).

Root: vah (class 1)

Note: Refers to the marital alliance with Draupadi.

पाञ्चालाः (pāñcālāḥ) - the Panchalas

(proper noun)

Nominative, masculine, plural of pāñcāla

pāñcāla - inhabitants of Panchala country, the Panchalas (proper name of a people/kingdom)

सख्येन (sakhyena) - by friendship

(noun)

Instrumental, neuter, singular of sakhya

sakhya - friendship, alliance, intimacy

Derived from 'sakhi' (friend).

अन्धकवृष्णयः (andhakavṛṣṇayaḥ) - the Andhakas and Vrishnis

(proper noun)

Nominative, masculine, plural of andhakavṛṣṇi

andhakavṛṣṇi - the Andhakas and Vrishnis (two Yadu clans, Krishna's relatives)

Compound type : Dvandva (andhaka+vṛṣṇi)

• andhaka – the Andhakas (a Yadu clan)
  proper noun (masculine)
• vṛṣṇi – the Vrishnis (a Yadu clan)
  proper noun (masculine)

Note: The second of the two groups mentioned as not giving aid.