Marks off is a commonly used term in different contexts, and there are several synonyms that can be used instead of it. If we are talking about marking a boundary, the synonyms for marks off include demarcates, delineates, and delimits, all of which signify the act of defining a particular area or space. Similarly, if marks off refer to grading or evaluation, the synonyms can be grades, evaluates, rates, and scores. Marks off can also refer to restricting or hindering a person's progress, in which case the synonyms can be hinders, impedes, obstructs, or stops. Choosing the right synonym depends on the context and the intended meaning.