उसी का

that person's

→ वह
phrase Rare #9,092
that person's Also means “his” or “her,” depending on context. उसी emphasizes that it is that particular person; का changes form to agree with the thing possessed.
HI: यह उसी का घर है।
EN: This is that person's house.

यह उसी का उत्सव है।

This is a celebration of that.

उसी का फ़ोन आ रहा है।

He’s calling.

— Monica, O My Darling (2022)