वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-61, verse-7

ताव् उभौ युगपद्वीरौ हनूमद् राक्षसोत्तमौ ।
उल्काहस्तौ तदा रात्रौ रणशीर्षे विचेरतुः ॥७॥

7. tāv ubhau yugapadvīrau hanūmad rākṣasottamau ,
ulkāhastau tadā rātrau raṇaśīrṣe viceratuḥ.

7. tau ubhau yugapat vīrau hanūmat rākṣasottamau
ulkāhastau tadā rātrau raṇaśīrṣe viceratuḥ

7. tadā rātrau tau ubhau vīrau hanūmat rākṣasottamau
ulkāhastau yugapat raṇaśīrṣe viceratuḥ

7. Then, those two heroes, Hanumān and the best of the rakshasas (Vibhīṣaṇa), both simultaneously, with torches in hand, roamed on the battlefield during the night.

Words meanings summery:

• तौ (tau) - those two (referring to Hanuman and Vibhishana) (those two, both of them)

• उभौ (ubhau) - both (Hanuman and Vibhishana) (both)

• युगपत् (yugapat) - simultaneously (simultaneously, at the same time, together)

• वीरौ (vīrau) - two heroes (two heroes, two brave men)

• हनूमत् (hanūmat) - Hanumān (Hanuman)

• राक्षसोत्तमौ (rākṣasottamau) - the best of the rakshasas (Vibhishana) (the best of rakshasas, excellent rakshasas)

• उल्काहस्तौ (ulkāhastau) - with torches in hand (holding torches in hand)

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

• रात्रौ (rātrau) - during the night (in the night, during the night)

• रणशीर्षे (raṇaśīrṣe) - on the battlefield (on the battlefield, at the head of the battle)

• विचेरतुः (viceratuḥ) - they two roamed (they two wandered, roamed)

Words meanings and morphology

तौ (tau) - those two (referring to Hanuman and Vibhishana) (those two, both of them)

(pronoun)

Nominative, masculine, dual of tad

tad - that, he, she, it

Note: Refers to hanūmat and rākṣasottamau.

उभौ (ubhau) - both (Hanuman and Vibhishana) (both)

(pronoun)

Nominative, masculine, dual of ubha

ubha - both

Always occurs in dual.

Note: Agrees with tau.

युगपत् (yugapat) - simultaneously (simultaneously, at the same time, together)

(indeclinable)

Note: Adverb of manner/time.

वीरौ (vīrau) - two heroes (two heroes, two brave men)

(noun)

Nominative, masculine, dual of vīra

vīra - hero, brave, valiant man

Note: Appositive to tau ubhau.

हनूमत् (hanūmat) - Hanumān (Hanuman)

(proper noun)

Nominative, masculine, singular of hanūmat

hanūmat - Hanuman (a monkey deity, son of the wind god)

Note: First of the two individuals described.

राक्षसोत्तमौ (rākṣasottamau) - the best of the rakshasas (Vibhishana) (the best of rakshasas, excellent rakshasas)

(noun)

Nominative, masculine, dual of rākṣasottama

rākṣasottama - best of rakshasas, excellent demon

Compound type : tatpuruṣa (rākṣasa+uttama)

• rākṣasa – rakshasa, demon
  noun (masculine)
• uttama – best, highest, excellent, supreme
  adjective
  Superlative of ut (up, forth)
  Prefix: ut

Note: The second of the two individuals described.

उल्काहस्तौ (ulkāhastau) - with torches in hand (holding torches in hand)

(adjective)

Nominative, masculine, dual of ulkāhasta

ulkāhasta - having a torch in hand

Compound type : bahuvrihi (ulkā+hasta)

• ulkā – torch, meteor, firebrand
  noun (feminine)
• hasta – hand, trunk (of an elephant)
  noun (masculine)

Note: Appositive to the subjects.

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

(indeclinable)

Note: Temporal adverb.

रात्रौ (rātrau) - during the night (in the night, during the night)

(noun)

Locative, feminine, singular of rātri

rātri - night

Note: Locative of time.

रणशीर्षे (raṇaśīrṣe) - on the battlefield (on the battlefield, at the head of the battle)

(noun)

Locative, neuter, singular of raṇaśīrṣa

raṇaśīrṣa - battlefield, front of battle

Compound type : tatpuruṣa (raṇa+śīrṣa)

• raṇa – battle, war, combat
  noun (masculine)
  Root: raṇ (class 1)
• śīrṣa – head, top, peak, forepart
  noun (neuter)

Note: Locative of place.

विचेरतुः (viceratuḥ) - they two roamed (they two wandered, roamed)

(verb)

3rd person , dual, active, past perfect (liṭ) of car

Perfect Active

3rd person dual, Perfect tense, active voice. From root √car with prefix vi.

Prefix: vi

Root: car (class 1)

Note: The main verb of the sentence.