क्षणं स्वस्ति ।तदेव भुङ्ग इति स्वस्तिभुक्; भक्तानां मङ्गलं म्वस्ति भुनक्तीति वा स्वस्तिभुक् ।स्वस्तिरूपेण दक्षते बर्धते, स्वम्ति दातुं समर्थ इति वा स्वस्तिदक्षिणः ।अथवा, दक्षिणशव्द आशुकारिणि वर्तते; शीघ्रं स्वस्ति दातुम् अयमेव समर्थ इति, यस्य स्मरणादेव सिध्यन्ति सर्वसिद्धयः, 'स्मृते सकलकल्याणभाजनं यत्र जायते ।पुरुपस्तमजं नित्यं व्रजामि शरणं हरिम् ॥स्मरणादेव कृष्णस्य पापसंघातपञ्जरम् ।शतधा भेदमायाति गिरिर्वत्रहतो यथा' इत्यादिवचनेभ्यः ।
In plain words
He is Svastibhuk because he sustains and protects the well-being of his devotees. He is Svastidakṣiṇa because he prospers in the form of auspiciousness and is supremely potent in bestowing grace. Alternatively, the term dakṣiṇa signifies swift action, meaning he alone is prompt to grant well-being, for by his mere remembrance all perfections are attained. As scripture declares: 'I ever take refuge in the unborn Hari, by remembering whom a person becomes the vessel of all blessings.' And again: 'Just as a mountain struck by Indra's thunderbolt shatters into fragments, so the cage of sin is broken into a hundred pieces simply by remembering Krishna.'
Close to the Sanskrit
Svastibhuk because he enjoys or protects well-being. Svastidakṣiṇa because he grows in the form of well-being and is capable of bestowing it. Alternatively, the word dakṣiṇa means quick-acting; he alone is capable of quickly bestowing well-being, by whose mere remembrance all accomplishments arise: 'Whereupon a person becomes a vessel of all welfare upon remembrance, I constantly take refuge in the unborn Hari.' 'Just as a mountain struck by a thunderbolt breaks into a hundred pieces, the cage of Krishna's accumulated sins shatters upon mere remembrance,' from such verses.