महाभारतः mahābhārataḥ - book-1, chapter-150, verse-2

आकारेणैव तं ज्ञात्वा पाण्डुपुत्रो युधिष्ठिरः ।
रहः समुपविश्यैकस्ततः पप्रच्छ मातरम् ॥२॥

2. ākāreṇaiva taṁ jñātvā pāṇḍuputro yudhiṣṭhiraḥ ,
rahaḥ samupaviśyaikastataḥ papraccha mātaram.

2. ākāreṇa eva tam jñātvā pāṇḍuputraḥ yudhiṣṭhiraḥ
rahaḥ samupaviśya ekaḥ tataḥ papraccha mātaram

2. Yudhiṣṭhira, the son of Pāṇḍu, recognizing him (Bhīma) simply by his demeanor, then sat down alone in a private place and asked his mother.

Words meanings summery:

• आकारेण (ākāreṇa) - by Bhīma's facial expression/demeanor (by the expression, by the gesture, by the form)

• एव (eva) - only, just, indeed, very

• तम् (tam) - (Bhīma) (him, that one)

• ज्ञात्वा (jñātvā) - having known, having recognized

• पाण्डुपुत्रः (pāṇḍuputraḥ) - Yudhiṣṭhira, as a son of Pāṇḍu (the son of Pāṇḍu)

• युधिष्ठिरः (yudhiṣṭhiraḥ) - Yudhiṣṭhira

• रहः (rahaḥ) - in secret, in private, solitude

• समुपविश्य (samupaviśya) - having sat down

• एकः (ekaḥ) - Yudhiṣṭhira being alone (alone, one)

• ततः (tataḥ) - then, thence, afterwards

• पप्रच्छ (papraccha) - asked, questioned

• मातरम् (mātaram) - his (Yudhiṣṭhira's) mother (Kuntī) (mother)

Words meanings and morphology

आकारेण (ākāreṇa) - by Bhīma's facial expression/demeanor (by the expression, by the gesture, by the form)

(noun)

Instrumental, neuter, singular of ākāra

ākāra - form, shape, appearance, gesture, expression, demeanor

From root kṛ with prefix ā, and nominal suffix -a.

Prefix: ā

Root: kṛ (class 8)

एव (eva) - only, just, indeed, very

(indeclinable)

तम् (tam) - (Bhīma) (him, that one)

(pronoun)

Accusative, masculine, singular of tad

tad - that, he, she, it

ज्ञात्वा (jñātvā) - having known, having recognized

(indeclinable)

Absolutive/Gerund

From root jñā, absolutive form.

Root: jñā (class 9)

पाण्डुपुत्रः (pāṇḍuputraḥ) - Yudhiṣṭhira, as a son of Pāṇḍu (the son of Pāṇḍu)

(proper noun)

Nominative, masculine, singular of pāṇḍuputra

pāṇḍuputra - son of Pāṇḍu

Compound type : tatpuruṣa (pāṇḍu+putra)

• pāṇḍu – pale, yellowish-white; Name of a king, father of the Pāṇḍavas
  proper noun (masculine)
• putra – son, child
  noun (masculine)

युधिष्ठिरः (yudhiṣṭhiraḥ) - Yudhiṣṭhira

(proper noun)

Nominative, masculine, singular of yudhiṣṭhira

yudhiṣṭhira - firm in battle; Name of the eldest Pāṇḍava brother

रहः (rahaḥ) - in secret, in private, solitude

(indeclinable)

Note: Often used adverbially as an indeclinable.

समुपविश्य (samupaviśya) - having sat down

(indeclinable)

Absolutive/Gerund

From root viś with prefixes sam and upa, absolutive form.

Prefixes: sam+upa

Root: viś (class 6)

एकः (ekaḥ) - Yudhiṣṭhira being alone (alone, one)

(adjective)

Nominative, masculine, singular of eka

eka - one, single, alone, unique

ततः (tataḥ) - then, thence, afterwards

(indeclinable)

पप्रच्छ (papraccha) - asked, questioned

(verb)

3rd person , singular, active, past perfect (Lit) of papraccha

Perfect Active

From root prach, perfect tense, 3rd person singular.

Root: prach (class 6)

मातरम् (mātaram) - his (Yudhiṣṭhira's) mother (Kuntī) (mother)

(noun)

Accusative, feminine, singular of mātṛ

mātṛ - mother