महाभारतः mahābhārataḥ - book-7, chapter-133, verse-21

तावद्गर्जसि राधेय यावत्पार्थं न पश्यसि ।
पुरा पार्थं हि ते दृष्ट्वा दुर्लभं गर्जितं भवेत् ॥२१॥

21. tāvadgarjasi rādheya yāvatpārthaṁ na paśyasi ,
purā pārthaṁ hi te dṛṣṭvā durlabhaṁ garjitaṁ bhavet.

21. tāvat garjasi rādheya yāvat pārtham na paśyasi purā
pārtham hi te dṛṣṭvā durlabham garjitam bhavet

21. rādheya tvam tāvat garjasi yāvat pārtham na paśyasi
hi purā pārtham dṛṣṭvā te garjitam durlabham bhavet

21. O son of Rādhā, you boast only as long as you do not see Pārtha (Arjuna). Indeed, once you have seen Pārtha, such boasting will become difficult for you.

Words meanings summery:

• तावत् (tāvat) - so long, so much, so far

• गर्जसि (garjasi) - you roar, you boast

• राधेय (rādheya) - O Karṇa (O son of Rādhā)

• यावत् (yāvat) - as long as, until

• पार्थम् (pārtham) - Arjuna, son of Pṛthā

• न (na) - not

• पश्यसि (paśyasi) - you see

• पुरा (purā) - before, formerly

• पार्थम् (pārtham) - Arjuna, son of Pṛthā

• हि (hi) - indeed, surely, because

• ते (te) - your (boasting) (by you, for you, your)

• दृष्ट्वा (dṛṣṭvā) - having seen

• दुर्लभम् (durlabham) - difficult to obtain, rare

• गर्जितम् (garjitam) - roaring, boasting

• भवेत् (bhavet) - it would be, it may be

Words meanings and morphology

तावत् (tāvat) - so long, so much, so far

(indeclinable)

गर्जसि (garjasi) - you roar, you boast

(verb)

2nd person , singular, active, present (lat) of garj

present active

2nd person singular, parasmaipada

Root: garj (class 1)

राधेय (rādheya) - O Karṇa (O son of Rādhā)

(proper noun)

Vocative, masculine, singular of rādheya

rādheya - son of Rādhā

Taddhita formation from Rādhā

यावत् (yāvat) - as long as, until

(indeclinable)

पार्थम् (pārtham) - Arjuna, son of Pṛthā

(proper noun)

Accusative, masculine, singular of pārtha

pārtha - son of Pṛthā, Arjuna

Taddhita formation from Pṛthā

न (na) - not

(indeclinable)

पश्यसि (paśyasi) - you see

(verb)

2nd person , singular, active, present (lat) of dṛś

present active

2nd person singular, parasmaipada, root 'dṛś' takes 'paśya' stem in present tense

Root: dṛś (class 1)

पुरा (purā) - before, formerly

(indeclinable)

पार्थम् (pārtham) - Arjuna, son of Pṛthā

(proper noun)

Accusative, masculine, singular of pārtha

pārtha - son of Pṛthā, Arjuna

Taddhita formation from Pṛthā

हि (hi) - indeed, surely, because

(indeclinable)

ते (te) - your (boasting) (by you, for you, your)

(pronoun)

Genitive, singular of tvad

tvad - you

enclitic form of tvad

दृष्ट्वा (dṛṣṭvā) - having seen

(indeclinable)

absolutive

suffix -tvā

Root: dṛś (class 1)

दुर्लभम् (durlabham) - difficult to obtain, rare

(adjective)

Nominative, neuter, singular of durlabha

durlabha - difficult to obtain, rare, hard to find

from dur- + √labh

Compound type : pradi-samāsa (dur+labha)

• dur – difficult, bad, hard
  indeclinable
• labha – obtaining, acquiring, gain
  noun (masculine)
  from √labh
  Root: labh (class 1)

Note: Agrees with garjitam.

गर्जितम् (garjitam) - roaring, boasting

(noun)

Nominative, neuter, singular of garjita

garjita - roared, boasted, roaring, boast (noun)

Past Passive Participle (used as noun)

from √garj + -ta

Root: garj (class 1)

Note: Subject of bhavet.

भवेत् (bhavet) - it would be, it may be

(verb)

3rd person , singular, active, potential (vidhiliṅ) of bhū

potential mood

3rd person singular, parasmaipada

Root: bhū (class 1)