When we talk about "butt up", it usually refers to aligning or positioning something in a straight and upright manner. To express the same meaning, we can use various synonyms that would fit perfectly in different contexts. Some of these synonyms include "align", "straighten", "position", "place", "settle", "stack", "arrange", "adjust", "level", "even", "flush", "match", and "balance". Each of these synonyms illustrates the idea of bringing something into an orderly or well-structured way. Whether it's pieces of furniture, files, or personal perspectives, using suitable synonyms for "butt up" will help convey a more accurate description of the desired outcome.