eavesdrop
US
UK eavesdrop vi: (listen secretly)
SC 偷听 tōu tīng
SC 窃听 tōu tīng，qiè tīng
I didn't intend to eavesdrop but they were talking just outside my door.
不是我要偷听，他们就站在我的门外讲话。
eavesdrop on [sb/sth] vi + prep: (listen secretly to)
SC 偷听…的谈话
SC 对...窃听
How did you know that? Were you eavesdropping on my phone call?
你是怎么知道的？你当时在对我的电话进行窃听吗？