buying; the thing someone buys거 is a casual shortened form of 것, meaning “thing.” With 사다, 사는 거 refers to buying something or the thing being bought; the examples use the past form 산 거, “the thing someone bought.”
KO: 이건 내가 사는 거야.
EN: This is what I’m buying.
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livingA colloquial form of 사는 것, referring to the act or experience of living.