butt in on somebody

Từ điển Oxford Advanced Learner 8th

ˌbutt ˈin (on sb/sth) derived
1. to interrupt a conversation rudely
•How can I explain if you keep butting in?
•+ speech ‘Is that normal?’ Josie butted in.
2. (informal)to become involved in a situation that does not concern you
Syn: ↑interfere
•I didn't ask you to butt in on my private business.
Main entry: ↑butt_derived