Startoff is a verb meaning to begin or commence something. However, there are a number of antonyms for startoff that can be used to convey different meanings. Some antonyms for startoff include end, finish, conclude, complete, and close. These words convey the idea of ending something, rather than beginning it. Other antonyms for startoff include delay, postpone, procrastinate, and defer. These words convey the idea of putting off or avoiding starting something. Other antonyms for startoff include stop, halt, cease, and abort. These words convey the idea of stopping something that has already been started. Together, these antonyms for the word startoff provide a range of ways to describe beginning, continuing or ending a task, project or process.