Slave away is an expression that is often used to describe working hard or diligently. However, there are several synonyms that can be used to convey a similar meaning. Some examples include labor, toil, work hard, grind, sweat, exert oneself, endeavor, hustle, and slog. Each of these words describes the effort and commitment required to achieve a goal or complete a task. Whether it is studying for an exam, completing a project at work, or training for a marathon. Using different synonyms can help to add variety to your writing and avoid using repetitive language.