योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-25, verse-19

अपानस्य बहिष्ठं तमपरं पूरकं विदुः ।
बाह्यानाभ्थन्तरांश्चैतान्कुम्भकादीननारतम् ॥ १९ ॥

apānasya bahiṣṭhaṃ tamaparaṃ pūrakaṃ viduḥ ,
bāhyānābhthantarāṃścaitānkumbhakādīnanāratam 19

19. apānasya bahiṣṭham tam aparam pūrakaṃ viduḥ |
bāhyān ābhyantarān ca etān kumbhakādīn anāratam

19. They understand that other, most external retention (pūraka) to be related to the downward-moving breath (apāna). And they constantly practice these external and internal techniques, beginning with breath retention (kumbhaka).

Words meanings summery:

• अपानस्य (apānasya) - of the downward-moving breath (apāna)

• बहिष्ठम् (bahiṣṭham) - most external, external

• तम् (tam) - that, him, it

• अपरम् (aparam) - other, another

• पूरकं (pūrakaṁ) - inhalation, retention (pūraka)

• विदुः (viduḥ) - they know, they understand

• बाह्यान् (bāhyān) - external (masculine plural)

• आभ्यन्तरान् (ābhyantarān) - internal (masculine plural)

• च (ca) - and, also

• एतान् (etān) - these (masculine plural)

• कुम्भकादीन् (kumbhakādīn) - beginning with kumbhaka, kumbhaka and others

• अनारतम् (anāratam) - constantly, continuously

Words meanings and morphology

अपानस्य (apānasya) - of the downward-moving breath (apāna)

(noun)

Genitive, masculine, singular of apāna

apāna - downward-moving vital air, out-breath (apāna)

Prefix: apa

Root: an (class 2)

बहिष्ठम् (bahiṣṭham) - most external, external

(adjective)

Accusative, masculine, singular of bahiṣṭha

bahiṣṭha - most external, outer, situated outside

superlative of bahis

तम् (tam) - that, him, it

(pronoun)

Accusative, masculine, singular of tad

tad - that, it

अपरम् (aparam) - other, another

(adjective)

Accusative, masculine, singular of apara

apara - other, another, subsequent, inferior

पूरकं (pūrakaṁ) - inhalation, retention (pūraka)

(noun)

Accusative, masculine, singular of pūraka

pūraka - inhalation, filling, fulfilling, a filler (pūraka)

agent noun

from root pūr (to fill)

Root: pūr (class 10)

विदुः (viduḥ) - they know, they understand

(verb)

3rd person , plural, active, present indicative (laṭ) of vid

Root: vid (class 2)

बाह्यान् (bāhyān) - external (masculine plural)

(adjective)

Accusative, masculine, plural of bāhya

bāhya - external, outer, relating to the outside

आभ्यन्तरान् (ābhyantarān) - internal (masculine plural)

(adjective)

Accusative, masculine, plural of ābhyantara

ābhyantara - internal, inner, inner part, esoteric

च (ca) - and, also

(indeclinable)

एतान् (etān) - these (masculine plural)

(pronoun)

Accusative, masculine, plural of etad

etad - this, these

कुम्भकादीन् (kumbhakādīn) - beginning with kumbhaka, kumbhaka and others

(noun)

Accusative, masculine, plural of kumbhakādi

kumbhakādi - beginning with kumbhaka, kumbhaka etc.

Compound type : bahuvrīhi (kumbhaka+ādi)

• kumbhaka – breath retention (kumbhaka)
  noun (masculine)
• ādi – beginning, etcetera, and so on
  noun (masculine)

अनारतम् (anāratam) - constantly, continuously

(indeclinable)