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소리를 듣고

hear a sound and

→ 소리
phrase Uncommon #9,118
hear a sound and The ending -고 links this action to what happens next; depending on context, it can also mean “after hearing a sound.”
KO: 밖에서 소리를 듣고 문을 열었어요.
EN: I heard a sound outside and opened the door.

피리 소리를 듣고 온 겁니까?

Did you come here after hearing the sound of the flute?

— 홍등 (1991)