거 사

buy something

→ 것
phrase Rare #25,053
buy something 거 means “thing” and is a conversational form of 것. 사 is the verb stem of 사다, “to buy,” so it usually appears with a following ending or another verb.
KO: 오늘 간식으로 먹을 거 사 올게.
EN: I’ll buy something for a snack and bring it back.

저기 형수님은 나중에 더 좋은 거 사 드릴게요

Hey, I’ll get you something better later, sis-in-law.

— Oasis (2002)

겨울 인데 옷 좀 따뜻한 거 사 입어

Since it's winter, buy some warm clothes to wear.

— 로렌스 애니웨이 (2012)