to interrupt someone when they are speaking.
The verb ‘butt’ actually means to hit something with your head, like a ram (belier). Zinedine Zidane famously head-butted an Italian player in the world cup final.
“I’m sorry to butt in, but could I just say that I don’t agree with you on this point.”
“I wasn’t able to finish my presentation because people kept butting in.”
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