To a finish is an idiomatic expression used to indicate the completion of a task or activity. There are several synonyms that can be used to convey a similar meaning, such as completed, concluded, finished, ended, wrapped up, finalised, accomplished, polished off, and brought to a close. Each of these synonyms infers that the task at hand has been fully executed, and there is an absence of any further work or continuation required. When you are looking for an alternative to the expression 'to a finish,' choose the synonym that applies best to the situation you are referring to and use it in context appropriately.