महाभारतः mahābhārataḥ - book-3, chapter-155, verse-15

उपर्युपरि शैलस्य बह्वीश्च सरितः शिवाः ।
प्रस्थं हिमवतः पुण्यं ययौ सप्तदशेऽहनि ॥१५॥

15. uparyupari śailasya bahvīśca saritaḥ śivāḥ ,
prasthaṁ himavataḥ puṇyaṁ yayau saptadaśe'hani.

15. uparyupari śailasya bahvīḥ ca saritaḥ śivāḥ
prastham himavataḥ puṇyam yayau saptadaśe ahani

15. He observed many auspicious rivers high up on the mountains, and on the seventeenth day, he reached the sacred plateau of the Himalayas.

Words meanings summery:

• उपर्युपरि (uparyupari) - high up on, over (high above, on top of, over and over)

• शैलस्य (śailasya) - of the mountain

• बह्वीः (bahvīḥ) - many (many, numerous)

• च (ca) - and

• सरितः (saritaḥ) - rivers

• शिवाः (śivāḥ) - auspicious (auspicious, benevolent, pure)

• प्रस्थम् (prastham) - the plateau (plateau, level ground)

• हिमवतः (himavataḥ) - of the Himalayas (of the Himalayas (Himavat))

• पुण्यम् (puṇyam) - sacred (sacred, holy, meritorious)

• ययौ (yayau) - reached (went, reached, proceeded)

• सप्तदशे (saptadaśe) - on the seventeenth

• अहनि (ahani) - day

Words meanings and morphology

उपर्युपरि (uparyupari) - high up on, over (high above, on top of, over and over)

(indeclinable)

Reduplicated form of upari (an adverb/preposition).

शैलस्य (śailasya) - of the mountain

(noun)

Genitive, masculine, singular of śaila

śaila - mountain, rock, rocky

बह्वीः (bahvīḥ) - many (many, numerous)

(adjective)

Accusative, feminine, plural of bahu

bahu - much, many, numerous, abundant

च (ca) - and

(indeclinable)

सरितः (saritaḥ) - rivers

(noun)

Accusative, feminine, plural of sarit

sarit - river, stream

Root: sṛ (class 1)

शिवाः (śivāḥ) - auspicious (auspicious, benevolent, pure)

(adjective)

Accusative, feminine, plural of śiva

śiva - auspicious, propitious, benevolent, happy, pure

प्रस्थम् (prastham) - the plateau (plateau, level ground)

(noun)

Accusative, neuter, singular of prastha

prastha - level ground, plateau, tableland, summit

हिमवतः (himavataḥ) - of the Himalayas (of the Himalayas (Himavat))

(proper noun)

Genitive, masculine, singular of himavat

himavat - Himavat (the Himalayas personified), snowy mountain

Possessive suffix -vat.

पुण्यम् (puṇyam) - sacred (sacred, holy, meritorious)

(adjective)

Accusative, neuter, singular of puṇya

puṇya - sacred, holy, virtuous, meritorious, good

ययौ (yayau) - reached (went, reached, proceeded)

(verb)

3rd person , singular, active, perfect (lit) of yā

Perfect tense, 3rd person singular

Root: yā (class 2)

सप्तदशे (saptadaśe) - on the seventeenth

(adjective)

Locative, neuter, singular of saptadaśa

saptadaśa - seventeenth

अहनि (ahani) - day

(noun)

Locative, neuter, singular of ahan

ahan - day, daylight