butt out



  • verb to stop interfering, keep out, leave somewhere. Usually in the form of an instruction to remove oneself, butt out is a fairly mild, if brusque expression. The butt component is interesting in that it is probably inspired by ‘butt in’, in which case it derives from ‘butt’ meaning to strike or push with the head. (It is commonly assumed to derive from butt, meaning the backside.).