{v.}, {slang} To join in with what other people are doing without asking or being asked; interfere in other people's business; meddle. * /Mary was explaining to Jane how to knit a sweater when Barbara butted in./ Often used with "on". * /John butted in on Bill and Tom's fight, and got hurt./ Compare: HORN IN.
BUTT IN
Meaning of BUTT IN in English
Dictionary of English idioms . Словарь английских идиом. 2012