The works of Ādi Śaṅkarācārya

Viṣṇusahasranāmastotram

Verse 421

नात् ।देशतः कालतः वस्तुतश्चापरिच्छिन्नत्वात् अनन्तात्मा ।संहृत्य सर्वभूतान्येकार्णवं जगत्कृत्वा अधिशेते महोदधिमिति महोदधिशयः ।अन्तं करोति भूतानामिति अन्तकः ।'तत्करोति तदाचष्टे' इति णिचि ण्वुलि अकादेशः ॥

In plain words

Nothing marks him off — not place, not time, not any thing that is. So: Anantātmā, the Self without end. He gathers all beings back in, turns the world into one unbroken ocean, and lies stretched out upon that great sea. So: Mahodadhiśayaḥ, the one who reclines on the vast waters. He makes an end of beings. So: Antakaḥ, the Ender. As for the form of the word: by the rule "he makes that, he declares that," the causative ṇic is added; then the agent-suffix ṇvul, which shows up as aka — anta plus aka, antaka.

Close to the Sanskrit

...nāt. Because of being undelimited by place, by time, and by substance — Anantātmā. Having withdrawn all beings, having made the world one single ocean, he lies upon the great ocean: thus Mahodadhiśayaḥ. He makes an end of beings: thus Antakaḥ. By the rule 'he makes that, he declares that', ṇic being added, and ṇvul being added, there is the substitution aka.