在群里等待的英文说法是 "waiting in the group". 来源是指这个词组是由两个单词组成的："waiting" 和 "group"。"waiting" 是动词，意思是等待，而 "group" 是名词，意思是一群人或群体。

例句：

I have been waiting in the group for over an hour. 我在群里等了一个多小时了。
Many people are waiting in the group for the sale to begin. 许多人都在群里等待销售开始。
We decided to wait in the group until everyone arrived. 我们决定在群里等大家都到齐。

请注意，"waiting in the group" 这个说法本身并不是一种正式的英语表达方式，它只是一种口语化的说法。如果想表达同样的意思，你可以使用更正式的表达方式，比如 "waiting in the crowd" 或 "waiting with the others"。

例句：

I have been waiting in the crowd for over an hour. 我在人群中等了一个多小时了。
Many people are waiting with the others for the sale to begin. 许多人都在和其他人一起等待销售开始。
We decided to wait with the others until everyone arrived. 我们决定和其他人一起等大家都到齐。