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틈을

a gap; an opening

→ 틈
phrase Rare #23,463
a gap; an opening 틈 means a physical gap or opening, and can also mean an opportunity or opening to act. 을 is the object particle.
KO: 문틈을 통해 바람이 들어와요.
EN: Air comes in through the gap in the door.

그 틈을 찾아내

Find that opening.

— 걸리 보이 (2019)

틈을 전혀 주지 않죠

You don't give me any opening at all.

— 당갈 (2016)