योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-78, verse-14

तत्प्रीतौ तत्समारम्भावन्योन्यं तौ बभूवतुः ।
अथ साविरतं राम रमणीयपदक्रमान् ॥ १४ ॥

tatprītau tatsamārambhāvanyonyaṃ tau babhūvatuḥ ,
atha sāvirataṃ rāma ramaṇīyapadakramān 14

14. tat-prītau tat-samārambhau anyonyam tau babhūvatuḥ
atha sa-aviratam rāma ramaṇīya-pada-kramān

14. tau tat-prītau tat-samārambhau anyonyam babhūvatuḥ
atha rāma sa-aviratam ramaṇīya-pada-kramān

14. Those two became mutually devoted to Him and embarked upon His undertakings. Then, O Rāma, without interruption, (he heard) the delightful sequences of words...

Words meanings summery:

• तत्-प्रीतौ (tat-prītau) - delighted by Him, devoted to Him

• तत्-समारम्भौ (tat-samārambhau) - undertaking His deeds, commencing His enterprises

• अन्योन्यम् (anyonyam) - each other, mutually

• तौ (tau) - those two

• बभूवतुः (babhūvatuḥ) - they became, they were

• अथ (atha) - then, thereafter, now

• स-अविरतम् (sa-aviratam) - without interruption, continuously

• राम (rāma) - O Rāma

• रमणीय-पद-क्रमान् (ramaṇīya-pada-kramān) - delightful sequences of words/steps

Words meanings and morphology

तत्-प्रीतौ (tat-prītau) - delighted by Him, devoted to Him

(adjective)

Nominative, masculine, dual of tat-prīta

tat-prīta - delighted by that, devoted to that

Compound type : tatpuruṣa (tad+prīta)

• tad – that, Him
  pronoun (neuter)
• prīta – pleased, delighted, beloved
  participle (masculine)
  Past Passive Participle
  Derived from √prī (to please, satisfy).
  Root: prī (class 9)

तत्-समारम्भौ (tat-samārambhau) - undertaking His deeds, commencing His enterprises

(noun)

Nominative, masculine, dual of tat-samārambha

tat-samārambha - undertaking His actions/enterprises

Compound type : tatpuruṣa (tad+samārambha)

• tad – that, His
  pronoun (neuter)
• samārambha – commencement, undertaking, enterprise
  noun (masculine)
  nominal derivative
  Derived from √rabh (to begin) with prefixes 'sam-' and 'ā-'.
  Prefixes: sam+ā
  Root: rabh (class 1)

अन्योन्यम् (anyonyam) - each other, mutually

(indeclinable)

तौ (tau) - those two

(pronoun)

Nominative, masculine, dual of tad

tad - that, those

बभूवतुः (babhūvatuḥ) - they became, they were

(verb)

3rd person , dual, active, perfect (liṭ) of bhū

Perfect tense, 3rd person dual, active voice

Formed from the root √bhū (to be, to become).

Root: bhū (class 1)

अथ (atha) - then, thereafter, now

(indeclinable)

स-अविरतम् (sa-aviratam) - without interruption, continuously

(adjective)

Accusative, neuter, singular of sa-avirata

sa-avirata - without cessation, continuous

Compound type : avyayībhāva (sa+avirata)

• sa – with, together with
  indeclinable
• avirata – not ceased, continuous
  participle (masculine)
  Past Passive Participle (negative)
  Derived from √ram (to stop) with prefixes 'a-' (neg.) and 'vi-'.
  Prefixes: a+vi
  Root: ram (class 1)

Note: Used adverbially here.

राम (rāma) - O Rāma

(proper noun)

Vocative, masculine, singular of rāma

rāma - Rāma (proper name)

रमणीय-पद-क्रमान् (ramaṇīya-pada-kramān) - delightful sequences of words/steps

(noun)

Accusative, masculine, plural of ramaṇīya-pada-krama

ramaṇīya-pada-krama - delightful sequence of words/steps

Compound type : tatpuruṣa (ramaṇīya+pada+krama)

• ramaṇīya – delightful, pleasing
  gerundive (masculine)
  Gerundive/Future Passive Participle
  Derived from √ram (to delight).
  Root: ram (class 1)
• pada – word, step, foot, abode
  noun (neuter)
• krama – sequence, order, step
  noun (masculine)
  nominal derivative
  Derived from √kram (to step, go).
  Root: kram (class 1)