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본 걸

what (someone) saw

→ 보다
phrase Rare #32,390
what (someone) saw 걸 is a shortened form of 것을, meaning “thing” as the object of a verb. 본 indicates that the seeing happened in the past.
KO: 내가 본 걸 너도 봤어?
EN: Did you see what I saw too?

사람들 에게 내가 본 걸 말해 주고 싶었지만 그럴 수 없었다.

I wanted to tell people what I had seen, but I couldn't.