overhear

I happened to overhear my colleagues discussing the secret office party while I was in the elevator.

(Chinese) 我在电梯里时无意中听到同事们在讨论办公室的秘密派对。

She sat quietly in the cafe and couldn't help but overhear the couple's argument at the next table.

(Chinese) 她静静地坐在咖啡馆里，不由得听到了隔壁桌那对情侣的争吵。