योगवासिष्ठः yogavāsiṣṭhaḥ - book-1, chapter-33, verse-21

तैस्तैः प्रणयसंरम्भैरन्योन्यं प्राप्तसत्क्रियाः ।
उपाविशन्विष्टरेषु नभश्चरमहीचराः ॥ २१ ॥

taistaiḥ praṇayasaṃrambhairanyonyaṃ prāptasatkriyāḥ ,
upāviśanviṣṭareṣu nabhaścaramahīcarāḥ 21

21. taiḥ taiḥ praṇayasaṃrambhaiḥ anyonyam prāptasatkriyāḥ
upāviśan viṣṭareṣu nabhaścaramahīcarāḥ

21. nabhaścaramahīcarāḥ taiḥ taiḥ praṇayasaṃrambhaiḥ
anyonyam prāptasatkriyāḥ viṣṭareṣu upāviśan

21. Having mutually received hospitality through various affectionate gestures, the sky-dwellers and earth-dwellers then sat down on their respective seats.

Words meanings summery:

• तैः (taiḥ) - Referring to the various gestures and expressions. (by those)

• तैः (taiḥ) - Reinforcing "various" with the previous taiḥ. (by those)

• प्रणयसंरम्भैः (praṇayasaṁrambhaiḥ) - with displays of affection, with expressions of cordiality

• अन्योन्यम् (anyonyam) - mutually, each other

• प्राप्तसत्क्रियाः (prāptasatkriyāḥ) - Describes the state of the sky-dwellers and earth-dwellers. (having received hospitality/honors)

• उपाविशन् (upāviśan) - they sat down

• विष्टरेषु (viṣṭareṣu) - Refers to formal seating arrangements for guests. (on the seats, on the cushions)

• नभश्चरमहीचराः (nabhaścaramahīcarāḥ) - Refers to celestial beings/sages and human kings/sages. (sky-dwellers and earth-dwellers)

Words meanings and morphology

तैः (taiḥ) - Referring to the various gestures and expressions. (by those)

(pronoun)

Instrumental, masculine, plural of tad

tad - that, he, she, it

Note: Agreement with praṇayasaṃrambhaiḥ.

तैः (taiḥ) - Reinforcing "various" with the previous taiḥ. (by those)

(pronoun)

Instrumental, masculine, plural of tad

tad - that, he, she, it

Note: Agreement with praṇayasaṃrambhaiḥ.

प्रणयसंरम्भैः (praṇayasaṁrambhaiḥ) - with displays of affection, with expressions of cordiality

(noun)

Instrumental, masculine, plural of praṇayasaṃrambha

praṇayasaṁrambha - outburst/display of affection or love

Tatpuruṣa compound: praṇaya (affection) + saṃrambha (display, outburst).

Compound type : tatpuruṣa (praṇaya+saṃrambha)

• praṇaya – affection, love, cordiality, intimacy
  noun (masculine)
  From pra-ṇī (to lead forward).
  Prefix: pra
  Root: ṇī (class 1)
• saṃrambha – excitement, vehemence, display, outburst
  noun (masculine)
  From sam-rabh (to seize, begin, be excited).
  Prefix: sam
  Root: rabh (class 1)

Note: Indicates the means by which hospitality was exchanged.

अन्योन्यम् (anyonyam) - mutually, each other

(indeclinable)

Compound of anya (other) + anya (other).

Note: Qualifies the action of "receiving hospitality."

प्राप्तसत्क्रियाः (prāptasatkriyāḥ) - Describes the state of the sky-dwellers and earth-dwellers. (having received hospitality/honors)

(adjective)

Nominative, masculine, plural of prāptasatkriya

prāptasatkriya - one who has received hospitality/honors

Bahuvrīhi compound: prāpta (obtained) + satkriyā (hospitality).

Compound type : bahuvrīhi (prāpta+satkriyā)

• prāpta – obtained, gained, received
  adjective
  Past Passive Participle
  From pra-āp (to obtain).
  Prefix: pra
  Root: āp (class 5)
• satkriyā – hospitality, honorable action, good deed
  noun (feminine)
  Karmadhāraya compound: sat (good) + kriyā (action).
  Root: kṛ (class 8)

Note: Agrees with nabhaścaramahīcarāḥ.

उपाविशन् (upāviśan) - they sat down

(verb)

3rd person , plural, active, past imperfect (laṅ) of upa-viś

Imperfect tense, 3rd plural.

From root viś with upasarga upa.

Prefix: upa

Root: viś (class 6)

Note: Main verb of the sentence.

विष्टरेषु (viṣṭareṣu) - Refers to formal seating arrangements for guests. (on the seats, on the cushions)

(noun)

Locative, masculine, plural of viṣṭara

viṣṭara - seat, cushion, mat, couch

From vi-stṛ (to spread out).

Prefix: vi

Root: stṛ (class 5)

Note: Indicates the location of sitting.

नभश्चरमहीचराः (nabhaścaramahīcarāḥ) - Refers to celestial beings/sages and human kings/sages. (sky-dwellers and earth-dwellers)

(noun)

Nominative, masculine, plural of nabhaścaramahīcara

nabhaścaramahīcara - sky-dwellers and earth-dwellers

Dvandva compound of nabhaścara and mahīcara.

Compound type : dvandva (nabhaścara+mahīcara)

• nabhaścara – sky-dweller, celestial being
  noun (masculine)
  From nabhas (sky) and cara (moving, going).
  Root: car (class 1)
• mahīcara – earth-dweller, human
  noun (masculine)
  From mahī (earth) and cara (moving, going).
  Root: car (class 1)

Note: Subject of the verb upāviśan.