There are several synonyms for the phrase "out of square". Some of the most commonly used synonyms include "off-kilter", "crooked", "uneven", "misaligned", "out of line", "out of true", and "skewed". Each of these words can be used interchangeably to describe an object or structure that is not perfectly aligned or has a slight tilt. Whether you're referencing a picture hanging on the wall or a building with a leaning roof, these synonyms help convey the idea of something being slightly off-balance or not quite right. By using a variation of these words, you can add depth and nuance to your language and more accurately describe the object in question.