chime in
1．join in singing 跟着唱起来
The singer asked the audience to chime in．这位歌手请大家跟着一起唱。
The whole group chimed in on the chorus．全组的人都参加合唱。
2．express agreement；break into a conversation同意；插话
He was so interested in our discussion that he chimed in from time to time．他对我们的讨论非常感兴趣，不时地插话。
I thought you'd chime in．我想你会同意的。