महाभारतः mahābhārataḥ - book-3, chapter-275, verse-51

विधाय रक्षां लङ्कायां विभीषणपुरस्कृतः ।
संततार पुनस्तेन सेतुना मकरालयम् ॥५१॥

51. vidhāya rakṣāṁ laṅkāyāṁ vibhīṣaṇapuraskṛtaḥ ,
saṁtatāra punastena setunā makarālayam.

51. vidhāya rakṣām laṅkāyām vibhīṣaṇapuraskṛtaḥ
santatāra punaḥ tena setunā makarālayam

51. Having established protection in Lanka, with Vibhishana in charge, he again crossed the ocean (makarālaya) by that bridge.

Words meanings summery:

• विधाय (vidhāya) - having established, having performed, having made

• रक्षाम् (rakṣām) - protection, guarding, preservation

• लङ्कायाम् (laṅkāyām) - in Lanka (the city/island of Ravana) (in Lanka)

• विभीषणपुरस्कृतः (vibhīṣaṇapuraskṛtaḥ) - having Vibhishana at the forefront, with Vibhishana in charge

• सन्ततार (santatāra) - he crossed, he passed over

• पुनः (punaḥ) - again, further, moreover

• तेन (tena) - by that, with that

• सेतुना (setunā) - by the bridge, with the bridge

• मकरालयम् (makarālayam) - the ocean (specifically the Indian Ocean, between India and Lanka) (the abode of crocodiles, the ocean)

Words meanings and morphology

विधाय (vidhāya) - having established, having performed, having made

(indeclinable)

Absolutive (Gerund)

Derived from root dhā with prefix vi-, and suffix -ya (after upasarga)

Prefix: vi

Root: dhā (class 3)

रक्षाम् (rakṣām) - protection, guarding, preservation

(noun)

Accusative, feminine, singular of rakṣā

rakṣā - protection, guarding, preservation, defense

Root: rakṣ (class 1)

लङ्कायाम् (laṅkāyām) - in Lanka (the city/island of Ravana) (in Lanka)

(proper noun)

Locative, feminine, singular of laṅkā

laṅkā - Lanka (proper name of the island kingdom)

विभीषणपुरस्कृतः (vibhīṣaṇapuraskṛtaḥ) - having Vibhishana at the forefront, with Vibhishana in charge

(adjective)

Nominative, masculine, singular of vibhīṣaṇapuraskṛta

vibhīṣaṇapuraskṛta - having Vibhishana as the chief, with Vibhishana at the forefront

Compound type : bahuvrīhi (vibhīṣaṇa+puraskṛta)

• vibhīṣaṇa – Vibhishana (proper name, Ravana's brother, ally of Rama)
  proper noun (masculine)
• puraskṛta – placed in front, honored, made chief, appointed
  adjective (masculine)
  Past Passive Participle
  Derived from root kṛ with prefix puras-
  Prefix: puras
  Root: kṛ (class 8)

Note: Refers to Rama (implied subject from previous verse).

सन्ततार (santatāra) - he crossed, he passed over

(verb)

3rd person , singular, active, Perfect (liṭ) of santatāra

Prefix: sam

Root: tṛ (class 1)

पुनः (punaḥ) - again, further, moreover

(indeclinable)

तेन (tena) - by that, with that

(pronoun)

Instrumental, masculine, singular of tad

tad - that, this, he, she, it

Note: Agrees with setunā.

सेतुना (setunā) - by the bridge, with the bridge

(noun)

Instrumental, masculine, singular of setu

setu - bridge, dam, causeway, boundary

मकरालयम् (makarālayam) - the ocean (specifically the Indian Ocean, between India and Lanka) (the abode of crocodiles, the ocean)

(noun)

Accusative, masculine, singular of makarālaya

makarālaya - abode of makaras (sea monsters/crocodiles), the ocean

Compound type : tatpuruṣa (makara+ālaya)

• makara – a sea monster, crocodile, a mythical aquatic animal
  noun (masculine)
• ālaya – abode, dwelling, house, receptacle
  noun (masculine)
  Prefix: ā
  Root: lī (class 4)