break into a conversation;
"her husband always chimes in, even when he is not involved in the conversation"
- Don't try to cut in while others are talking.
- She broke in with some ideas of her own.
- She disowned any hand in the matter.
- They fiddled in other governments.
- Don't meddle in other people's affairs.
- I've always tried not to interfere in your affairs.
- butt in 插嘴