noun · a side remark or comment that deviates from the main subject of discussion

他在报告中加入了几段有趣的插话，使气氛变得轻松了许多。

verb · to interpose or interject a remark into a conversation while someone else is speaking

随便打断别人的谈话是不礼貌的，请先听我说完，不要插话。