वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-72, verse-21

अयं त्वां सचिवैः सार्धं महात्मा रजनीचरः ।
अभिज्ञस्तस्य देशस्य पृष्ठतो ऽनुगमिष्यति ॥२१॥

21. ayaṃ tvāṃ sacivaiḥ sārdhaṃ mahātmā rajanīcaraḥ ,
abhijñastasya deśasya pṛṣṭhato'nugamiṣyati.

21. ayam tvām sacivaiḥ sārdham mahātmā rajanīcaraḥ
abhijñaḥ tasya deśasya pṛṣṭhataḥ anugamiṣyati

21. This noble demon (Vibhīṣaṇa), along with his ministers, is familiar with that region and will follow you from behind.

Words meanings summery:

• अयम् (ayam) - this one (referring to Vibhishana) (this (masculine singular nominative))

• त्वाम् (tvām) - you (Rama) (you (accusative singular))

• सचिवैः (sacivaiḥ) - with his (Vibhishana's) ministers (by ministers, with ministers)

• सार्धम् (sārdham) - along with (with, together with)

• महात्मा (mahātmā) - noble, virtuous (describing Vibhishana) (great-souled, noble, magnanimous person)

• रजनीचरः (rajanīcaraḥ) - demon (referring to Vibhishana) (night-walker, demon)

• अभिज्ञः (abhijñaḥ) - familiar with (knowing, familiar with, expert)

• तस्य (tasya) - of that (specific) (of that)

• देशस्य (deśasya) - of that region (Lanka) (of the place, of the region)

• पृष्ठतः (pṛṣṭhataḥ) - from behind (from behind, at the back)

• अनुगमिष्यति (anugamiṣyati) - will follow

Words meanings and morphology

अयम् (ayam) - this one (referring to Vibhishana) (this (masculine singular nominative))

(pronoun)

Nominative, masculine, singular of idam

idam - this

Note: Subject of the sentence.

त्वाम् (tvām) - you (Rama) (you (accusative singular))

(pronoun)

Accusative, singular of yuṣmad

yuṣmad - you

Note: Object of `anugamiṣyati`.

सचिवैः (sacivaiḥ) - with his (Vibhishana's) ministers (by ministers, with ministers)

(noun)

Instrumental, masculine, plural of saciva

saciva - companion, minister, associate

Note: Used with `sārdham`.

सार्धम् (sārdham) - along with (with, together with)

(indeclinable)

Note: Governs `sacivaiḥ`.

महात्मा (mahātmā) - noble, virtuous (describing Vibhishana) (great-souled, noble, magnanimous person)

(adjective)

Nominative, masculine, singular of mahātman

mahātman - great-souled, noble person, magnanimous

Compound type : bahuvrihi (mahat+ātman)

• mahat – great, large
  adjective
• ātman – self, soul, spirit, essence
  noun (masculine)

Note: Qualifies `ayam` / `rajanīcaraḥ`.

रजनीचरः (rajanīcaraḥ) - demon (referring to Vibhishana) (night-walker, demon)

(noun)

Nominative, masculine, singular of rajanīcara

rajanīcara - night-walker, demon, rakshasa

Compound type : tatpurusha (rajanī+cara)

• rajanī – night
  noun (feminine)
• cara – moving, going, walking
  adjective (masculine)
  Agent Noun from root car
  Root: car (class 1)

Note: In apposition to `ayam`.

अभिज्ञः (abhijñaḥ) - familiar with (knowing, familiar with, expert)

(adjective)

Nominative, masculine, singular of abhijña

abhijña - knowing, familiar with, expert, intelligent

Prefix: abhi

Root: jñā (class 9)

Note: Qualifies `ayam` / `rajanīcaraḥ`. Governs genitive `tasya deśasya`.

तस्य (tasya) - of that (specific) (of that)

(pronoun)

Genitive, masculine, singular of tad

tad - that, he, she, it

Note: Qualifies `deśasya`.

देशस्य (deśasya) - of that region (Lanka) (of the place, of the region)

(noun)

Genitive, masculine, singular of deśa

deśa - place, region, country

Note: Governed by `abhijñaḥ`.

पृष्ठतः (pṛṣṭhataḥ) - from behind (from behind, at the back)

(indeclinable)

Suffix -tas added to pṛṣṭha

Note: Adverb of place for `anugamiṣyati`.

अनुगमिष्यति (anugamiṣyati) - will follow

(verb)

3rd person , singular, active, future (lṛṭ) of gam

Future Tense, 3rd Person Singular

From root gam 'to go' with prefix anu 'after, along'

Prefix: anu

Root: gam (class 1)

Note: Verb for `ayam`.