The phrase "on slant" typically refers to something that is slanted or tilted in a particular direction. Synonyms for this phrase include "tilted," "askew," "angled," "inclined," or "sloping." These words convey a sense of deviation or departure from the vertical or horizontal, and can be used to describe a variety of physical and metaphorical situations. For example, a bookshelf might be "on slant" if it is not level, while a person's opinion might be described as "on slant" if it is biased or one-sided. Regardless of the context, these synonyms all suggest a sense of imbalance or irregularity.