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걸 보면

judging by

→ 것+을
phrase Rare #27,744
judging by Used to draw a conclusion from something observed or known. 걸 is a shortened form of 것을.
KO: 네가 그렇게 말하는 걸 보면 이미 결정했구나.
EN: Judging by the way you say that, you've already decided.

차 소리가 요란한 걸 보면 도시는 도시 인데?

With all that traffic noise, it’s definitely a city, but...

— Oldboy (2003)