Definition: to hear what someone is saying when they are not talking to you Level: C2
她无意中听到同事们在讨论项目。
She accidentally ___overheard her coworkers discussing the project.
他在火车上无意中听到两个陌生人之间的对话。
He ___overheard a conversation between two strangers on the train.
未经允许偷听私人对话是不礼貌的。
It's rude to ___overhear private conversations without permission.
