But-butt merger

The but-butt merger is the merger of /V/ and /3/. Some Scottish English speakers distinguish the vowels in "but" and "butt" as /bVt/ and /b3t/, "bus" /bVs/ and "buss" /b3s/, "mud" /mVd/ and "Fudd" /f3d/, "dun" /dVn/ and "Dunn" /d3n/ "sun" /sVn/ and "sunn" /s3n/ etc.