窃听

eavesdrop; wiretap; tap; bug

♦ ~电话 tap a telephone

♦ 他怕有人~, 不敢在电话里说。 He was afraid of being bugged, and didn't dare to talk over the phone.

♦ 他在窗外~屋里人谈话。 He hid just outside the window and eavesdropped on the conversation going on inside the room.