When something is not on the line, it means that it is not aligned or in the correct position. There are various synonyms that can be used to describe this kind of situation, including off the mark, off-center, askew, out of alignment, or crooked. These terms are all related to something that is not positioned correctly, either intentionally or unintentionally. The phrase "not on the line" can be applied to a range of scenarios, from objects that are not straight or evenly spaced to people who deviate from the norm. By using these alternative phrases, you can add variety to your language and convey the idea of something being out of place in a more precise way.