overheard

adj.串音的；偶而听到的

动词overhear的过去式和过去分词形式.

I overheard them quarrelling. 我无意中听到他们吵架。

I overheard their argument/them. 我偷听到他们争论[他们说话]。

I overheard some cruel remarks about him. 我无意中听到了一些议论他的粗鲁的话。

I overheard them saying they were unhappy. 我偶然听到他们说，他们很不快乐。