महाभारतः mahābhārataḥ - book-1, chapter-17, verse-4

ततः पिबत्सु तत्कालं देवेष्वमृतमीप्सितम् ।
राहुर्विबुधरूपेण दानवः प्रापिबत्तदा ॥४॥

4. tataḥ pibatsu tatkālaṁ deveṣvamṛtamīpsitam ,
rāhurvibudharūpeṇa dānavaḥ prāpibattadā.

4. tataḥ pibatsu tatkālam deveṣu amṛtam īpsitam
rāhuḥ vibudharūpeṇa dānavaḥ prāpibat tadā

4. Then, at that very moment, while the gods were drinking the desired nectar, the demon Rahu also drank it, disguised in the form of a god.

Words meanings summery:

• ततः (tataḥ) - then, at that moment (then, thereafter, from that)

• पिबत्सु (pibatsu) - while drinking (among the gods) (while drinking, in (the state of) drinking)

• तत्कालम् (tatkālam) - at that very moment (at that time, then, immediately)

• देवेषु (deveṣu) - among the gods (among the gods, in the gods)

• अमृतम् (amṛtam) - nectar (the drink of immortality) (nectar, immortality)

• ईप्सितम् (īpsitam) - desired (desired, wished for, longed for)

• राहुः (rāhuḥ) - Rahu (Rahu (name of a demon))

• विबुधरूपेण (vibudharūpeṇa) - in the form of a god, disguised as a god (in the form of a god, as a learned one)

• दानवः (dānavaḥ) - the demon (demon (son of Danu))

• प्रापिबत् (prāpibat) - drank

• तदा (tadā) - then (then, at that time)

Words meanings and morphology

ततः (tataḥ) - then, at that moment (then, thereafter, from that)

(indeclinable)

पिबत्सु (pibatsu) - while drinking (among the gods) (while drinking, in (the state of) drinking)

(participle)

Locative, masculine, plural of pibat

pibat - drinking

present active participle

From root pā (to drink)

Root: pā (class 1)

Note: Agrees with 'deveṣu'.

तत्कालम् (tatkālam) - at that very moment (at that time, then, immediately)

(noun)

neuter, singular of tatkāla

tatkāla - that time, particular time

Compound type : tatpuruṣa (tad+kāla)

• tad – that, he/she/it
  pronoun (neuter)
• kāla – time
  noun (masculine)

Note: Used adverbially.

देवेषु (deveṣu) - among the gods (among the gods, in the gods)

(noun)

Locative, masculine, plural of deva

deva - god, deity

Root: div (class 4)

Note: Denotes the group among whom the action takes place.

अमृतम् (amṛtam) - nectar (the drink of immortality) (nectar, immortality)

(noun)

Accusative, neuter, singular of amṛta

amṛta - immortal, immortality, nectar, ambrosia

From a (neg.) + mṛta (dead, ppp of √mṛ)

Compound type : nañ-tatpuruṣa (a+mṛta)

• a – not, un-
  indeclinable
• mṛta – dead, died
  participle (masculine)
  past passive participle
  From root mṛ (to die)
  Root: mṛ (class 6)

Note: Object of 'pibatsu' and 'prāpibat'.

ईप्सितम् (īpsitam) - desired (desired, wished for, longed for)

(participle)

Accusative, neuter, singular of īpsita

īpsita - desired, wished for, obtained

past passive participle

From desiderative stem of √āp (to obtain)

Root: āp (class 5)

Note: Adjective modifying 'amṛtam'.

राहुः (rāhuḥ) - Rahu (Rahu (name of a demon))

(noun)

Nominative, masculine, singular of rāhu

rāhu - Rahu (the demon who causes eclipses)

Note: Subject of 'prāpibat'.

विबुधरूपेण (vibudharūpeṇa) - in the form of a god, disguised as a god (in the form of a god, as a learned one)

(noun)

Instrumental, neuter, singular of vibudharūpa

vibudharūpa - form of a god

Compound type : tatpuruṣa (vibudha+rūpa)

• vibudha – god, learned person
  noun (masculine)
  Derived from vi + budh (to awaken, know)
  Root: budh (class 1)
• rūpa – form, appearance
  noun (neuter)

Note: Indicates the form or disguise.

दानवः (dānavaḥ) - the demon (demon (son of Danu))

(noun)

Nominative, masculine, singular of dānava

dānava - son of Danu, demon

A patronymic from Danu.

Note: Apposition to 'rāhuḥ'.

प्रापिबत् (prāpibat) - drank

(verb)

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

Prefix: pra

Root: pā (class 1)

Note: Verb for 'rāhuḥ'.

तदा (tadā) - then (then, at that time)

(indeclinable)

Derived from pronominal stem 'tad'.

Note: Temporal adverb.