स्वविषयासंप्रयोगे चित्तस्य स्वरूपानुकारैवेन्द्रियाणां प्रत्याहारः ॥५४॥
svaviṣaya-asaṁprayoge cittasya svarūpānukāra-iv-endriyāṇāṁ pratyāhāraḥ ||54||

[RS] 2.54 Harmony with the emotions (pratyahara) is achieved when the senses cease to be engaged with external objects and thus that which is mutable in human beings (chitta) becomes similar to true nature.

[JW] 2.54 The withdrawal of the senses is as it were the imitation of the mind-stuff itself on the part of the organs by disjoining themselves from their objects.

[SS] 2.54 When the senses withdraw themselves from the objects and imitate, as it were, the nature of the mind-stuff, this is pratyahara. [p165]

[EB] 2.54 Pratyahara, withdrawal from sense objects, occurs when the senses do not come into contact with their respective sense objects. It corresponds, as it were, to the nature of the mind [when it is withdrawn from the sense objects]. [p297]

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(स्व, sva) = their own
(विषय, viṣaya) = object; thing
(, a) = not
(संप्रयोगे, saṁprayoge) = to come into contact with; to unite; to become one
(चित्तस्य, cittasya) = all that is mutable in humankind; mind
(स्व, sva) =  their own
(रूप, rūpa) =  form
(स्वरूप, svarūpa) = own form; own nature
(अनुकार, anukāra) = to imitate; to resemble; to appropriate
(एव, eva) = ike; as though; as it were
(इन्द्रियाणाम्, indriyāṇām) = via the senses; via the sense organs
(प्रत्याहारः, pratyāhāraḥ) = withdrawal of the senses; bringing inward; literally: fast with the senses; harmony with the emotions; harmony with the emotional body